Many Americans have been leaving their cars at home.
问题描述:
Many Americans have been leaving their cars at home.
leave为什么要加ing?
答
这是一个现在完成进行式表示习惯或情绪的用法的一个句子.
have been doing 是现在完成进行式的构成形式.
译为:许多美国人总是把车留在家里.
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