单项选择题

This is the second time that John __________ in his final exam.

A. has failed
B. fails
C. failed
D. failing
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单项选择题
Had she found the right buyer, she would have sold the house.
A. 只有找到了正式的买方，她才能售出房屋。
B. 要是找到了合适的买方，她就会把房屋售出了。
C. 如果找到了合适的买方，她就已经把房屋售出了。
D. 她已经找到了正式的买方，并会把房屋售出。
单项选择题
Last month more than a hundred workers were killed in the mine ______.
A. exploitation
B. explosion
C. explication
D. explosivity
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