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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2.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

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

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

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

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

5.單項(xiàng)選擇題A lecture hall is（）where students attend lectures.

A.there
B.which
C.one
D.that