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1. It's a rule for schools that students ________ bring mobile phones to the schools.
A.
couldn't
B.
may not
C.
needn't
D.
mustn't
【考点】
情态动词; 动词辨析;
【答案】
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单选题
普通
课时演练
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1. —Humans can't live _______ air.
—I agree with you.
A.
without
B.
with
C.
in
D.
for
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