Question

I _____ for five minutes; why don’t they come?

A. am calling　　　　　　　 B. called

C. was calling　　　　　　　 D. have been calling

 

Answer 1

D

用現(xiàn)在完成進(jìn)行時表示持續(xù)到現(xiàn)在的一段時間。