单选题____AwhenBsinceCforDwhereas
单选题
____
A
when
B
since
C
for
D
whereas
参考解析
解析：
when通常引导时间状语从句。since引导时间、原因状语从句。for引导原因状语从句。whereas引导转折关系句子，意思是“而……”。根据上下文判断前后句子为转折关系，故D选项为正确答案。
when通常引导时间状语从句。since引导时间、原因状语从句。for引导原因状语从句。whereas引导转折关系句子，意思是“而……”。根据上下文判断前后句子为转折关系，故D选项为正确答案。
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