—Excuse me, what’s this for? —It’s a cle...

—Excuse me, what’s this for?

—It’s a cleaner and it to pick up dirt.

A．uses

B．is used

C．is using

D．used

B 【解析】句意：——是用来干嘛的？——这是一个吸尘器，用来清理灰尘的。 B．is used，表示被动语态（一般现在时+及物动词的过去分词），意为“…被用作’,符合题意。A.uses是第三人称单数，C.is using 为现在进行时，D.used，use的过去式和过去分词形式，均不符合题意。

考点分析：

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