对于现在完成时的提问的一些问题先举个例子:when _ you _ this book?I _ it for two w
对于现在完成时的提问的一些问题
先举个例子:when _ you _ this book?I _ it for two weeks A、have;bought ;have had B、did ;buy ;have had 我知道答案是A,但我后来冒出了一个疑问 如果选B,语法上也没有错误,并且我曾经看到过这样一个句子:when did you finish your homework I have just finished my homework.那像这样的问句,什么时候问句里加完成时,什么时候加一般过去式呢