单项选择题

It was about 600 years ______ the first clock with a face and hour hand was made.

[A] that
[B] until
[C] before
[D] since
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单项选择题
Something must be clone ______ pollution, otherwise the world won't be fit for people to live in.
[A] with
[B] for
[C] about
[D] on
单项选择题
Most of his books ______ in this small room.
[A] are kept
[B] is kept
[C] keeps
[D] keeping
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