单项选择题

The librarian requires that all books（）returned before the last day of classes.

A. are
B. be
C. must be
D. would be

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单项选择题
The young man still denied（）the fire behind the store.

A. start
B. to start
C. having started
D. to have started
单项选择题
--Mum, you promised!--Well,（）. But it was you who didn't keep your word first.

A. so was I
B. so did I
C. so I was
D. so I did
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