IfirstmetLisathreeyearsago.She

I first met Lisa three years ago. She ________ at a radio shop at the time.

A．worked

B．was working

C．has worked

D．has been working

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Kangkang won the first place in the _______ in the school sports meet last week.

A．boy’s 100-meter race

B．boys’ 100-meter race

C．boy’s 100-meters race

D．boys’ 100-meters race

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-Someone’s knocking at the door. Is it your mother?
-No, dad. It _____be mom. I saw mom ____in the bedroom just now.

A．must, sleep	B．may, sleeping
C．needn’t, sleep	D．can’t , sleeping

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They waited and waited, and_____ he came back.

A．at once	B．at first
C．at the end	D．at last

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---It was ___________ who helped us out of danger.
---What brave and helpful children! We should learn from them.

A．they

B．them

C．their

D．theirs

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My mother was doing the cleaning in the sitting room ________ the telephone rang.

A．when

B．while

C．since

D．as soon as

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