單項選擇題

Biting your nails is（）habit.

A.an irritated
B.an irritating
C.irritating
D.irritated

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單項選擇題

We are（）how an error like this could have happened.

A.searching
B.researching
C.surveying
D.investigating

單項選擇題

After two（）delay, our train arrived at last.

A.hours frustrating
B.hours frustrated
C.hours’ frustrating
D.hours’f rustrated

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