-could youlend me that book you_me about when i telephoned you?-no,i am sorry,i can't.i gave it to a friend.A.were telling B.would tell C.had told D.had been telling看到两种答案A和B,到底选哪个?

选A。
you were telling me about when I telephoned you是修饰that book 的，做宾语补足语，而其他选项把它当作了从句。

选A
因为后面有when i telephoned you(当我给你打电话时），主句用过去进行时表示那一时刻正在干某事。

选A
表示我过去打电话的那个时候你说的要借给我

是A吧，表示当时正在作某事

我觉得选C...
A 没有必要用进行时态
B 从题目看应该是过去时啊`` ~

选A 因为 意思为，你可否把你正想告诉我时我打电话给你的那本书借给我？

-could you lend me that book you_ me about when i telephoned you?
-no,i am sorry,i can't.i gave it to a friend.
A.were telling B.would tell C.had told D.had been telling
选A
因为后面的when i telephoned you(当我给你打电话时)，表示一个瞬间动作，因此主句用过去进行时。