—I called you many times yesterday morning but I couldn’t get through. —Oh. My brother on

问题补充：

—I called you many times yesterday morning, but I couldn’t get through.

—Oh. My brother on the phone all the time!

A. was talking

B. has been talking

C. has talked

D. talked

答案：

(答案→)A. was talking

B. has been talking

C. has talked

D. talked

解析：考查时态。句意：昨天造成我给你打了多次电话，但是我就是无法接通。——哦,我的哥哥一直在占线。结合语境可知下文描述的是过去正在进行的动作，故用过去进行时态。选A。