题目内容：

have you read this book?
Have you read these books?
Yes,l ____it three days ago.
A.have done
B.have read
C.read
D.did
这个答案是D.为什么不选择C啊?

优质解答

刚才也差点选C.read 了,因为看到是three days ago,后来一想it 是这句话的关键,因为问句里提到的是 these books是复数,而it是单数,因此,这里是用did 来指代read these books这件事已经完成了,所以答案是D