单项选择题

After he worked out the solution, （） appeared a smile on his face.

A. it
B. here
C. what
D. there

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单项选择题

Please give Jim the schedule for tomorrow’s conference when he （） back. He is to chair the conference.

A. will come
B. come
C. comes
D. came

单项选择题

His father was put into （） prison, and he had to go to （） prison to visit him once in a while.

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

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