单项选择题

I didn’t know he came back（）I met him in the street.

A. since
B. when
C. until
D. after

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单项选择题

The language used in advertisements differs from（）used in ordinary readings.

A. which
B. it
C. what
D. that

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How many elephants did you see（）

A. No one
B. Nothing
C. None
D. Neither

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