单项选择题

I can hardly imagine Peter ______ across the Atlantic Ocean in 15 days.

A. sail
B. to sail
C. sailing
D. to have sailed
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单项选择题
This is the reason ______ he didn't come to the meeting.
A. in which
B. with which
C. that
D. for which
单项选择题
When ______ why he walked in without permission, he just stared at us and said nothing.
A. asking
B. asked
C. being asked
D. to be asked
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