单项选择题

The boy's father bought him a large toy train（）

A. to play with
B. to play with it
C. which to play with
D. at which to play

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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
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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