问题
In order to find the missing child，villagers ________ all they can over the past five hours.(2012·安徽)
A:did
B:do
C:had done
D:have been doing
B:do
C:had done
D:have been doing
正确答案是：
同类题型
I don’t mind telling you what I know.— You _______. I can manage it myself.
．Ican_____be a teacher. I’m not a very patient person.
What do you think of my plan of going to Kunming this summer— I quite agree. It can’t be _________.
On the ground , who was crying. [ ]
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