Volunteering our time to help people ________ a good way to _______our free time.

A. be; spend B. are; cost C. is; spend D. will; cost

 

C

【解析】

試題分析：句意：花時間志愿幫助別人是我們花費空閑時間的好方法。Volunteering our time to help people是動名詞做主語，說的是花時間志愿幫助別人這件事情，是第三人稱單數(shù)，要用is,spend花費，人作主語，cost花費，物作主語，結(jié)合語境可知選C。

考點：考查動詞辨析。

 

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