單項選擇題You()to lock the door at night.

A.shall
B.ought
C.must


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1.單項選擇題Silk()by Chinese for thousands of years now.

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

2.單項選擇題he patient acted on the doctor's ()and finallyrecovered.

A.advices
B.advise
C.advice

3.單項選擇題Let me()the case carefully before I draw a conclusion.

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

4.單項選擇題More and more people in China now()to work regularly.

A.drive
B.drives
C.have driven