单项选择题


A．principle
B．primary
C．primitive
D．principal
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单项选择题
A．due toB．contribute toC．owing toD．according to
A．due to
B．contribute to
C．owing to
D．according to
单项选择题
A．more seriousB．seriouslyC．worseD．less serious
A．more serious
B．seriously
C．worse
D．less serious
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