单项选择题

A number of new books（）in the library.

A. were seen
B. was seen
C. see
D. sees

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单项选择题
（）tomorrow, we would surely go to have a picnic.

A. If it is fine
B. When it is fine
C. Being fine
D. Were it to be fine
单项选择题
Perhaps the day will come（）our city will be without any pollution.

A. when
B. while
C. as
D. what
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