單項(xiàng)選擇題The problem is()by pollution.
A.caused
B.because
C.due
D.because of
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1.單項(xiàng)選擇題The mistake was()by carelessness of the assistant.
A.due
B.caused
C.because
D.owe
2.單項(xiàng)選擇題The volunteers started looking after other children()parents died of AIDS last year
A.whose
B.that
C.which
D.who
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