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问题: 单选7

The reason _______ we were late is _______ we missed the train.
A. why ; because B. why ; that
C. why ; why D. that ; that

解答:

The reason _______ we were late is _______ we missed the train
B. why ; that
_______ we missed the train后面是宾语从句,用why that从句
后面只能用that,排除AC,前面是原因状语从句只能用why,所以选B