答案解析

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正在进行时中,

谓语动词后加ing.

如:I\'m playing football.

2.

当动词做主语时,

要用动名词,

即动词加ing.

如:Making salad.

3.

一些特殊表达.

动词后再用动词要用动名词.

如:enjoy doing sth.

practice doing sth.

mind doing sth.

finish doing sth.

keep doing sth.

等

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