I was about to leave the telephone rang.A. thenB. whenC. thatD. and when

问题补充：

I was about to leave the telephone rang.

A. then

B. when

C. that

D. and when

答案：

A. then

(答案→)B. when

C. that

D. and when

解析：固定搭配be about to do sth when刚要做某事这时…。句意：我刚要出去这时电话铃响了。