【題目】— 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】

考查反意疑問句。句意:---有關權威一定會在明年實施更嚴格的交管措施確保交通安全,是吧?---是的,的確。)must have done強調(diào)動作的完成(一般沒有明確的過去時間狀語),問句要用"haven't/hasn't+主語"。故選C。

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