单项选择题

______frightened me was a loud crash from the next room.

A. How
B. What
C. That
D. Why
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单项选择题
It's better to avoid ______ downtown during the rush hour.
A. to drive
B. having driven
C. driving
D. to be driving
单项选择题
Only after half a year______to find the result of my experiment in his lab.
A. I begun
B. I had begun
C. have I begun
D. did I begin
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