单项选择题

You didn't know what the teacher said in the classroom You ______ asleep.

[A] must be
[B] must have been
[C] should be
[D] should have been
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单项选择题
His suggestion is that the thief ______ put into prison as soon as possible.
[A] is
[B] was
[C] be
[D] being
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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