单项选择题

It was not until he came back （）he knew the police were looking for him．

A．which
B．since
C．that
D．before

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单项选择题
The man we followed suddenly stopped and looked as if （）．whether he was going in the right direction．

A．seeing
B．having seen
C．to see
D．to have seen
单项选择题
（）can you find out how many chickens there are!

A. Counting them
B. By counting them
C. Only by counting them
D. Only have you counted them
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