单项选择题

He ______ in the doorway in order to light his cigarette.

A. arrested
B. entered
C. paused
D. hesitated
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单项选择题
It was a ______ for the climbers to reach the top of the mountain.
A. struggle
B. pain
C. force
D. difficulty
单项选择题
Supposing you ______ write, what would you do
A. couldn’t
B. can’t
C. may not
D. are unable
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