相关考题
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单项选择题
Before I got to the cinema, the film（）
A.had begun
B.has begun
C.is begun -
单项选择题
You（）to lock the door at night.
A.shall
B.ought
C.must -
单项选择题
Silk（）by Chinese for thousands of years now.
A.has been used
B.was used
C.is used
