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单选题
Jenny ______ have kept her word. I wonder why she changed her mind.
A
must
B
need
C
should
D
would
参考答案
参考解析
解析：
句意：Jenny本应该遵守诺言。我很好奇她为什么改变主意了。should have done sth.本应该做某事（实际上却没有）。must have done sth.表示对过去的肯定推测，意为“（过去）一定…”。need have done sth.主要用于否定句或疑问句，一般不用于肯定句。用于否定句时，表示“本不必做某事（但实际上却做了）”；用于疑问句时，用于询问某一过去动作的必要性。would have done sth.常用于虚拟式的主句之中，表示对过去的虚拟，意为“本会…”。句中表示“本应该…（却没有）”，故答案是C项，
句意：Jenny本应该遵守诺言。我很好奇她为什么改变主意了。should have done sth.本应该做某事（实际上却没有）。must have done sth.表示对过去的肯定推测，意为“（过去）一定…”。need have done sth.主要用于否定句或疑问句，一般不用于肯定句。用于否定句时，表示“本不必做某事（但实际上却做了）”；用于疑问句时，用于询问某一过去动作的必要性。would have done sth.常用于虚拟式的主句之中，表示对过去的虚拟，意为“本会…”。句中表示“本应该…（却没有）”，故答案是C项，
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