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單項選擇題

You（）to lock the door at night.

A.shall
B.ought
C.must

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單項選擇題

Silk（）by Chinese for thousands of years now.

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

單項選擇題

he patient acted on the doctor's （）and finallyrecovered.

A.advices
B.advise
C.advice