2. 外语
  3. They don’t have any idea about ________they have to do all the works by themselves.

They don’t have any idea about ________they have to do all the works by themselves.

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问题 They don’t have any idea about ________they have to do all the works by themselves.
选项 A、what
B、where
C、why
D、because
答案C
解析 介词的后面出现了从句，因此这里应填入引导名词性从句的连词。because是引导状语从句的连词。后面的句子是“S+V+O”形式的完整句子，所以排除what.在where和why之中，why最符合句子的意思。
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