(单选题)

Ordinary soap, ______ correctly, can deal with bacteria effectively.

A.used

B.to use

C.using

D.use

参考答案：A

参考解析：

考查非谓语动词。句意：如果正确使用的话，普通的肥皂可以有效对付细菌。Ordinary soap can deal with bacterial effectively是主句，______ correctly是条件状语，修饰Ordinary soap，逻辑主语Ordinary soap和use之间是被动关系，要用过去分词。故选A。

知识点：

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