—Linda, together with her parents, ______up the mess in the park at the moment.
—It’s meaningful to be a volunteer. Let’s join them.
A．is cleaningB．a(chǎn)re cleaningC．has cleanedD．have cleaned
A
此題考查主謂一致問題，her parents 是從屬結構，真正的主語是Linda，故謂語動詞用單數(shù)。
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