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【单选题】

It's necessary _____young people__ a foreign language.
[ ]

A.
for, learn
B.
for, to learn
C.
of, to learn
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参考答案:
参考解析:
.
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举一反三

【单选题】– Must I get up early tomorrow morning? – No, _________.

A.
you mustn’t
B.
I don’t think you have to
C.
you can’t
D.
you need