We ___clearing up the mess.

A. set out      B. set about      C. set aside        D. set back

B


解析:

考查動詞短語辨析。set out to do sth. set about doing sth. “開始做某事”； set aside“存儲，留出”； set back“使受挫折；使倒退”；故B語意；語法符合。  

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