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單項(xiàng)選擇題

He seemed to be unaware（）the trouble he was causing.

A.for
B.on
C.of
D.about

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單項(xiàng)選擇題

I can't see（）between these two books

A.a many difference
B.much difference
C.many difference
D.much a difference

單項(xiàng)選擇題

Letters, maps and pictures are（）

A.essays
B.files
C.documents
D.records