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單項選擇題

I don't think he will be back in an hour,（）?

A.doI
B.won‘t he
C.don‘t I
D.will he

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單項選擇題

Somebody asked her,（）

A.did he
B.didn‘t they
C.didn‘t he
D.did they

單項選擇題

Silk（）by Chinese for thousands of years now.

A.has used
B.has been used
C.was used
D.is used