While she on the phone a man walked into her room.A. is talkingB. talkedC. was talkingD.

问题补充：

While she on the phone, a man walked into her room.

A. is talking

B. talked

C. was talking

D. talk

答案：

A. is talking

B. talked

(答案→)C. was talking

D. talk

解析：句意：当她正在电话上说话时，一个男人走进了她的房间。联系下文可知前文描述的是过去某时正在进行的动作，故用过去进行时态，选C。