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【题目】— The authority concerned must have taken stricter measures to ensure traffic safety next year, ________it?

—Yes, definitely.

A.didn’tB.mustn’t

C.hasn’tD.won’t

【答案】C

【解析】

考查反意疑问句。句意:---有关权威一定会在明年实施更严格的交管措施确保交通安全,是吧?---是的,的确。)must have done强调动作的完成(一般没有明确的过去时间状语),问句要用"haven't/hasn't+主语"。故选C。

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