who can tell me what's the answer to this question

Question

The cleaner's job in our company is( )the hall and every office as clean as possible A：keep B：keeps C：keeping D：kept beg answer

Answer 1

C

作表语的， 要用非谓语动词，这里是“动名词”作表语，陈述主语The cleaner's job in our company 的内容。

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