Wang I hear that you along the Mekong River. Have you got everything ready?A. traveledB.

问题补充：

Wang, I hear that you along the Mekong River. Have you got everything ready?

A. traveled

B. are traveling

C. have traveled

D. travel

答案：

A. traveled

(答案→)B. are traveling

C. have traveled

D. travel

解析：句意：王，我听说你要去湄公河旅游。你都准备好了吗？从后面问你准备好了吗，可知王还没有出发，由此可知这里要表示将要发生的事情。现在进行时可以表示将要发生的动作，故选B。