题目内容：

( )或( )做主语时,谓语动词用单数形式,( )或( )做主语时,谓语动词用复数形式

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参考答案：(动词不定式 )或( 动名词)做主语时,谓语动词用单数形式；例如：1.Buying clothes is often a time-consuming job because those clothes that a person likes are rarely the cones that fit him or her.2...