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

3.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

4.單項(xiàng)選擇題That is the dog()name is Henry.

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

5.單項(xiàng)選擇題Last week I bought a flat()biggest room faced south.

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