单项选择题

Somebody ______ here only this morning.

A. must be
B. can be
C. must have been
D. should have been
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单项选择题
This is one of the most beautiful pictures of scenery that ______ displayed here.
A. is
B. are
C. has been
D. have been
单项选择题
He spoke so quickly that I did not ______ what he said.
A. catch
B. accept
C. take
D. listen
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