单项选择题

Peter could not believe his eyes______he saw old Jimmy dancing.

[A] when
B. since
C. if
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单项选择题
Be careful when ______ the road.
[A] crossing
B. to cross
C. cross
单项选择题
Has the man ever been to the farm
A. No, never.
B. No, but he will.
C. Yes, he has.
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