【題目】No matter what you do, you must be careful ________ what he said.

A. off B. at C. in D. about

【答案】D

【解析】句意:不管你做什么,你必須小心對待他所說的話。off關(guān)閉;at在具體時刻或地點;in里面;about關(guān)于,大約。這里be careful about是固定短語,當心,注意。故應(yīng)選D。

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