单项选择题

I can’t find the key to my office. I ______ have lost it on my way home.

A. would
B. should
C. must
D. ought to
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单项选择题
Mathematics ______ easy to learn.
A. is
B. are
C. can
D. feels
单项选择题
I’d rather you ______ anything about it for the time being.
A. do
B. don’t
C. didn’t do
D. didn’t
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