.---I’m going to the States for further study.-How long you there?A. had stayedB. di

问题补充：

.---I’m going to the States for further study.

---How long you there?

A. had , stayed

B. did, stay

C. have, stayed

D. are, staying

答案：

A. had , stayed

B. did, stay

C. have, stayed

(答案→)D. are, staying

解析：考查时态。“我要去美国继续深造了。”“你要在那里待多长时间？”A表示过去完成；B表示过去；C表示完成；D表示将来和进行。根据am going to可知，应该是将来的事情。故选D。