帮忙造下过去完成时的句子,
问题描述:
帮忙造下过去完成时的句子,
用以下4个词中的任意3个.
since ,for ,before ,yet
造成过去完成时的,
答
Since you left,I have been alone in this city.
自从你离开,我一直独自在这个城市生活.
He hasn't done much yet.
他做的还不很多.
I have been in China for 3 years.
我来中国已经3年了.