—Guys,Iwasreallywornout!Ican'twalkanyfurther!—Weshouldh...
问题详情:
— Guys, I was really worn out! I can't walk any further!
— We should have a rest. We ________ the cave a whole day.
A. exploring B. are exploring C. have been exploring D. explore
【回答】
C
知识点:动词时态与语态
题型:选择题