I borrowed the book three weeks ago.同义句转换 I _ _ the book since three weeks ago.

I borrowed the book three weeks ago.同义句转换 I _ _ the book since three weeks ago.

题目
I borrowed the book three weeks ago.同义句转换 I _ _ the book since three weeks ago.
I borrowed the book three weeks ago.
同义句转换 I _ _ the book since three weeks ago.
现在完成时since和for什么的弄不懂 have+v(pp) have什么时候用had
答案
have kept现在完成时的since 后加 点时间for 加 段时间比如:I haven't seen you since we graduated.I haven't seen you for 5 years.有一个过去时间,在描述在这个时间点之前发生的动作,用had doneI had done my wo...
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