题目内容
(请给出正确答案)
[单选题]
We must keep quiet__ we will be punished.
A.or
B.if
C.since
D.unless
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A.or
B.if
C.since
D.unless
第4题
We must keep our classroom().
A.cleaned
B.clean
C.cleaning
第7题
To keep ______ , we must do more outdoor exercises.
A.well
B.fine
C.fit
D.health
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