相关考题
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单项选择题
The problem is（）by pollution.
A.caused
B.because
C.due
D.because of -
单项选择题
The mistake was（）by carelessness of the assistant.
A.due
B.caused
C.because
D.owe -
单项选择题
The volunteers started looking after other children（）parents died of AIDS last year
A.whose
B.that
C.which
D.who
