答案:C.
翻译:我不知道昨天这起道路交通事故是怎样发生的。所以我想要知道证据。
解释:此题考查强调句型的特殊疑问句做宾语从句的用法。
1. 强调句型结构:It is/was + 被强调部分 + that + 句子未被强调部分。
其特点是:如果去掉it is/was和引导词that,则剩下部分是一个完整的句子(有时候需要调整句序)。
2. 给楼主变化一下看看:
如:The road accident happened suddenly yesterday.
对状语suddenly强调,则为:It was suddenly that the road accident happened yesterday.
而强调句型的特殊疑问句是真的被强调部分划线提问,对suddenly划线提问变为:
How was it that the road accident happened yesterday?
3. 如果该疑问句做宾语从句,则变成“疑问词/引导词 + 陈述句”结构即:how it was that the road accident happened yesterday.
所以,正确答案为C。
4. 答案B错误,原因在于the road accident happened yesterday中并不缺少表示sth的主语/宾语等,而会缺少how所代替的方式状语。
参考资料:英语牛人团