【題目】You must be ____it.It is not a joke.

A. worried aboutB. serious about

C. interested in

【答案】B

【解析】

句意:你必須認(rèn)真對(duì)待它,不是開(kāi)玩笑。

根據(jù)“not a joke”可知要認(rèn)真對(duì)待。 be serious about 對(duì)……認(rèn)真/嚴(yán)肅,be worried about擔(dān)心,be interested in對(duì)……感興趣;故選B。

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