单项选择题

It is unusual for there ______ so few students in the classroom.

[A] to be
[B] be
[C] being
[D] are
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单项选择题
Our country had made great efforts to promote the family-planning policy, but ______ the birth rate is getting higher and higher.
[A] as it were
[B] as it is
[C] as it be
[D] as it has been
单项选择题
______ can be judged from his physical appearance, he is very strong and healthy.
[A] Which
[B] That
[C] It
[D] As
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