英语：he has many duties,but his main job was to introduce the

英语：he has many duties,but his main job was to introduce the pop stars
his main job was to introduce the pop stars
为什么was 后面要加to?
liyt1010 1年前 已收到2个回答 举报
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yyw78351 幼苗

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表示还未做

1年前

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jingu_st 幼苗

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你知道动词不能做表语等名词性的成分,必须用动词时,只能用动词不定式to+do形式.例如:Yo see is to believe.

1年前

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