【題目】--Have you seen Jack? His mother is looking for him all the afternoon.

--No, I haven’t. I am sure her mother________be very worried.

A. must B. may C. need D. should

【答案】A

【解析】試題分析：句意：--你看到杰克了嗎？他的母親一下午都在找他。--不，我沒有。我確信他的母親一定非常擔(dān)心。分析：考查情態(tài)動(dòng)詞的用法，表示肯定的猜測(cè)用情態(tài)動(dòng)詞must.故選 A

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