相关考题
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单项选择题
Silk（）by Chinese for thousands of years now.
A.has been used
B.was used
C.is used -
单项选择题
he patient acted on the doctor's （）and finallyrecovered.
A.advices
B.advise
C.advice -
单项选择题
Let me（）the case carefully before I draw a conclusion.
A.look out
B.look into
C.look after
