单项选择题

A good many houses ______ knocked down by the earthquake.

A. was
B. were
C. is
D. are
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单项选择题
My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: Are you feeling all right
A. must be
B. must have been
C. had been
D. had to be
单项选择题
Mary wishes that she ______ law instead of history when she was in college.
A. had studied
B. has studied
C. studies
D. studied
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