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單項(xiàng)選擇題

I'm tired. I（）working very hard.

A.have
B.am
C.had
D.have been

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單項(xiàng)選擇題

They（）for hours.

A.have been driving
B.have been driven
C.drove
D.drive

單項(xiàng)選擇題

He has（）four successful books.

A.wrote
B.written
C.been writing