单项选择题

--I'm really thirsty. Do you think this water is safe ().
--Ask the farmer over there.

A.to drink
B.to be drunk
C.to drink it
D.to have it drunk

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单项选择题
People in this town () of a possible storm, and they're preparing for it;

A.would be warned
B.will be warned
C.have been warned
D.had been warned
单项选择题
The firemen arrived half an hour () the alarm was first raised, when it was too late to save much of the building.

A.since
B.after
C.as
D.until
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