单项选择题

"Do you hear someone knocking at the door"
"Yes, I did. I heard him () three times."

A. knocking
B. knocked
C. being knocking
D. knock

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单项选择题
You can take()seat you like.

A. no matter what
B. no matter which
C. what
D. whichever
单项选择题
The two thieves fled the town separately,()a bag.

A. each carrying
B. whose that watch is
C. whose watch is that
D. whose watch is
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