单项选择题

You didn’t know what the teacher said in the classroom You ______ asleep.

A. must be
B. must have been
C. should be
D. should have been
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单项选择题
Your mother has been ______ about you so much. Please don’t worry her any more.
A. worried B. worry
C. to be worried
D. to worry
单项选择题
Most of his books ______ in this small room.
A. are kept
B. is kept
C. keeps
D. keeping
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