问题: 一道英语选择题
Scientists are still trying hard to find out....caused SARS to spread so rapidly.
A.what was it that B.what it was that C.what was D.what was that
为什么不能选C
解答:
该句可这样分析:
将从句还原成独立句子
B为：it was (what) caused SARS to spread so rapidly （即it is/was ... that ...的强调句式）
C为：(what) was caused SARS to spread so rapidly (为病句）
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