______is not known yet.

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问题 ______is not known yet.

选项 A、Although he is serious about it
B、No matter how we will do the task
C、Whether we will go outing or not
D、Unless they come to see us

答案C

解析本题考查的是主语从句的用法。分析句子结构可以看出本句缺少主语，只能选择可以作主语的句子或成分。四个逸项中只有C项可以充当主语从句。although和no matter how常引导让步状语从句unless常引导条件状语从句。

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