单项选择题

As he was waiting downstairs, he suddenly heard a voice calling from ()

A. over
B. above
C. up
D. upon

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单项选择题

Be () when you cross the road.

A. careless
B. beware
C. careful
D. carelessness

单项选择题

I’d like to go with you. (), I have to finish the report now.

A. However
B. But
C. And
D. So

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