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—Is it necessary to look up every new word when I come across it in reading?
—No. You ________, because you are likely to guess the meaning from the context.
A.can'tB.mustn't
C.don't have to D.ought not to
C

试题分析:句意:---当我在阅读中遇到每一个生词的时候有必要去查字典吗?---没必要,因为你有可能从上下文中猜出意思来。A不能;B禁止;C没必要;D不应该。根据句意可知说话人认为没必要这样做,故答案选C。
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