单项选择题

Who can it be I’’m quite_________ a loss to guess.

A.of
B.on
C.in
D.at
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单项选择题
It was not until it got dark_________ working.
A.that they stopped
B.when they stopped
C.did they stop
D.that they didn’t stop
单项选择题
The results of the survey are interesting and they_________ more questions than they can answer.
A.bring about
B.prohibit
C.project
D.benefit from
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