单项选择题

The doctor suggests that I should sleep with the window open()it’s very cold .

A.if
B.unless
C.when
D.since
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单项选择题
He did not speak ________ he thought it over.
A.when
B.after
C.while
D.until
单项选择题
The teacher found that there were ________ students already there.
A.amount
B.a
C.many
D.a
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