Question

____ counts is ____ all those trapped in the building have been rescued.

A. It; that            B. What; because

C. What; that          D. Which; because

Answer

C

【解析】

试题分析：本题考查主语从句和表语从句。

分析句子可知，_____ counts 为句子主语，_____ all those trapped in the building have been rescued 为句子表语，两者分别为主语从句和表语从句。主语从句中缺少主语，所以使用关系代词 what 引导主语从句且在从句中充当主语；表语从句中 trapped in the building 为 all those 的后置定语，从句结构完整，整个句子语意清晰，所以使用 that 作引导词在从句中不充当任何成分。

故正确答案为C。

考点：考查表语从句。