单项选择题

When he heard how well the new company was doing, he took a calculated ______ and invested all his money in it.

A. risk
B. opportunity
C. danger
D. venture

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单项选择题

The people around him kept saying （）the drowned man but he went on doing artificial respiration.

A. it was useless reviving
B. there was no use reviving
C. there was no use to try to revive
D. it was no use trying to revive

单项选择题

______ the neighboring street, it would have had to pass through the station barriers, where a collector is always standing.

A. Had it not been pulled down
B. But for bringing it up
C. Should it not have been carried down from
D. Had it not been carried down from

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