2019年mpa考试英语真题——动词的时态250

{01}In the past 30 years, no human being____ foot on another world.
A.has set            
B.had set          
C.set                
D.sets
解析：
本题选A。
{02}The two friends _____ on the Internet for three hours, and they would go on till the next morning.

A.had been chatting

B.had chatted

C.were chatting

D.has been chatting

解析：句意：这两个朋友已经上网聊天3个小时了，而且还将继续到第二天早上。这个过去的过去一直在进行并且将延续到动作当然应该用过去完成进行时来表达。
本题选A。

{3}When I got home I realized that one of my suitcases ________.
A.disappears    
B.disappeared  
C.has disappeared    
D.had disappeared
解析：
本题选D。