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以下哪一个表达不能用来表示因果关系?
A、as
B、now that
C、above all
D、owing to
【正确答案】：C
【题目解析】：考察常用过渡词. 可以表示因果关系的过渡词有: because, as, since, for, in that, now that, because of , due to, thanks to, owing to, as a result of. C选项above all意为毕竟, 故选C.