问题
Who is knocking at the door?— _______.[ ]
A: They are the children
B: There are the children
C: It is the children
D: That is the children
B: There are the children
C: It is the children
D: That is the children
正确答案是：
同类题型
____ he works hard, I don’t mind when he finishes the experiment
doyou surf the Internet—Once a week.
This is not ______ watch. I think it’s ______.— Oh, I see. Thank you.
eakfast, he only drinks juicefrom fresh fruit____ on his own farm.
I don’t believe Jim is able to design a digital camera, ______?[ ]