单项选择题

______ Are Jim and Bob playing outside
— ______ They are doing their homework in the study.

A. Either
B. Both
C. Neither
D. None
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单项选择题
— It's difficult for the village children to cross the river for school. —I think a bridge ______ over the river.
A. was built
B. is being built
C. has been built
D. should be built
单项选择题
—Have you ______ your father recently —No. He doesn't often write to me.
A. heard about
B. heard of
C. heard from
D. got from
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