单项选择题

A lot of problems concerning education fee () at the conference.

A. came out
B. turned up
C. came up
D. steeled down

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单项选择题
The boy dived into the water and after () seemed to be a long time, he came up again.

A. what
B. that
C. it
D. which
单项选择题
The policeman happened () the traffic when the accident happened.

A. to direct
B. directing
C. to be directing
D. to have directed
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