单项选择题
A.wasn‘t there B.was there C.wasn‘t any D.was any
I don't think he will be back in an hour,（）?A.doIB.won‘...
单项选择题I don't think he will be back in an hour,（）?
A.doI B.won‘t he C.don‘t I D.will he
Somebody asked her,（）A.did heB.didn‘t theyC.didn‘t heD....
单项选择题Somebody asked her,（）
A.did he B.didn‘t they C.didn‘t he D.did they
Silk（）by Chinese for thousands of years now.A.has usedB...
单项选择题Silk（）by Chinese for thousands of years now.
A.has used B.has been used C.was used D.is used
