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

I’d rather（）it again.

A. you did
B. your doing
C. you to do
D. you doing

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Things of ______ kind come together; people of ______ kind fall into ______ same group.

A. the; the; the
B. a; a; the
C. the; the; a
D. a; the; the

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