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—Must I be in hospital for a week, Doctor? —No, you_________. You can go back home tomorrow.A. mustn’t B. needn’t C. must
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--Must we finish our homework now? --No, you ______. You _______ finish it after school.
A.needn't , mayB.mustn't , mayC.can't , canD.needn't , must
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“Must I finish my homework now?” “No, you() . But you() finish it this evening. ”
A. mustn’ t…mustB. needn’ t…mustC. can’ t…canD. can’ t…must
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9. _______you _______ stay at home today?A. Do ; have toB. Must; have toC. Have; toD. Do ; must
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He developed computer software to handle complicated______(finance) transactions.
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A:I haven't eaten all day.B: You __ be very hungry.A. shouldB. have toC. must
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A: I haven't sat down all day.B: You _____be very tired.A. couldB. have toC. must
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—_______ I return the book to the library this week?— No, you _______.You can keep it until the end of this month.
A.Must; needn’tB.Can; can’tC.May; mustn’tD.Can; mustn’t
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You want to start monitoring statistics on the distribution of storage engines that are being used and the average sizes of tables in the various databases.Some details are as follows:The Mysql instance has 400 databases. Each database on an average consists of 25-50 tables. You use the query:SELECT TABLE_SCHEMA, ‘ENGINE‘, COUNT (*), SUM(data_length) total_size FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE= ‘BASE TABLE‘ GROUP BY TABLE_SCHEMA, ‘ENGINE‘ ;Why is this query slow to execute?()A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tablesB.Aggregating details from various storage engine caches for the final output is time consumingC.Collecting information requires various disk-level operations and is time consumingD.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming
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3.—__________ 1 go out for a while?—No,you __________ You must finish your homework first.A. Must,needn'tB. Can,mayC. May,mustn'tD. May,must