单项选择题

Aren't you tired I ______ you had done enough for today.

A. should have thought
B. must have thought
C. might have thought
D. could have thought
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单项选择题
If there were no subjunctive mood, English ______ much easier to learn.
A. could have been
B. would be
C. will be
D. would have been
单项选择题
She ______ fifty or so when I first met her at a conference.
A. had been
B. must be
C. has been
D. must have been
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