【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關閉；at在具體時刻或地點；in在…里面；about關于，大約。這里be careful about是固定短語，當心，注意。故應選D。

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