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單項(xiàng)選擇題

The mistake was（）by carelessness of the assistant.

A.due
B.caused
C.because
D.owe

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The volunteers started looking after other children（）parents died of AIDS last year

A.whose
B.that
C.which
D.who

單項(xiàng)選擇題

I started looking after other children（）parents went out to work.

A.who
B.which
C.whose
D.that

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