单项选择题

By the time that the guards in the building realized what was happening, the fire（）

A. had already been put out
B. was put out
C. would have been put out
D. had put out

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

A. are
B. be
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The young man still denied（）the fire behind the store.

A. start
B. to start
C. having started
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