單項選擇題Silk()by Chinese for thousands of years now.
A.has been used
B.was used
C.is used
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1.單項選擇題he patient acted on the doctor's ()and finallyrecovered.
A.advices
B.advise
C.advice
2.單項選擇題Let me()the case carefully before I draw a conclusion.
A.look out
B.look into
C.look after
3.單項選擇題More and more people in China now()to work regularly.
A.drive
B.drives
C.have driven
4.單項選擇題The sun heats the earth,()is very important to living things.
A.that
B.what
C.which
5.單項選擇題All the team members tried their best. We lost the game,()
A.as
B.therefore
C.however
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