【題目】School students________ smoke because it is against the school rules.

A.needn'tB.couldn'tC.mustn'tD.won't

【答案】C

【解析】

句意:學生禁止吸煙,因為吸煙違反了學校規(guī)章制度。

考查情態(tài)動詞。needn’t不必;couldn’t不可能;mustn’t禁止;won't將不會,用于將來時。根據(jù) it is against the school rules,可知學生吸煙違反了學校規(guī)章制度,所以是明令禁止的。mustn't禁止。故選C。

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