问题
选择题
I was about to leave the office ______ the telephone rang．So I stopped ______ it．
A．when; to answer
B．when; to reply
C．while; answering
D．as; replying
答案
答案：B
考查短语搭配。be about to do sth. when...是固定搭配,"正要做某事时,....发生了"；stop to do停下来做。句意：我正要离开办公室的时候，突然电话响了。因此我停下来接它。