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单选题
He has just finished fixing the door, and it looks as though it is a very hard job.
A
it must have been
B
it was
C
to be
D
it must be
参考答案
参考解析
解析：
it looks as though 后面一般用虚拟语气，动词的过去式或过去完成时。该句表示与现在的事实相反，所以用过去式。
it looks as though 后面一般用虚拟语气，动词的过去式或过去完成时。该句表示与现在的事实相反，所以用过去式。
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