单项选择题

Not until it was completely dark （） working.

A. had they stopped
B. they stopped
C. they didn’t stop
D. did they stop

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单项选择题
The announcement （） greatly distressed the waiting passengers.

A. that all flights were cancelled
B. why all flights were cancelled
C. which all flights were cancelled
D. of which all flights were cancelled
单项选择题
______ the persons concerned had anything important to say.
A. No one of
B. Nobody of
C. None of
D. No one
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