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單項(xiàng)選擇題

We watched the plane（）behind the clouds.

A.disappearing
B.disappeared
C.diving
D.dived

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單項(xiàng)選擇題

Pipes made of plastic are now widely used in building as they are light and do not become （）in water.

A.ripe
B.instant
C.rotten
D.mature

單項(xiàng)選擇題

They were under the（）that the company was doing well, but in fact it was in serious trouble.

A.conclusion
B.expression
C.enjoyment
D.illusion