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單項(xiàng)選擇題

Silk（）by Chinese for thousands of years now.

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

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單項(xiàng)選擇題

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

A.advices
B.advise
C.advice

單項(xiàng)選擇題

Let me（）the case carefully before I draw a conclusion.

A.look out
B.look into
C.look after

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