has tom come yet?yes he has already been here for 5 minutes填yet;already的原因
题目
has tom come yet?yes he has already been here for 5 minutes填yet;already的原因
答案
在现在完成时中,yet 用于否定句和疑问句末.
already 常用于肯定句中.
has tom come yet?是疑问句,所以用yet .
he has already been here for 5 minutes是肯定句,所以用already .
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