第4题: [单项选择]I said nothing, ______ I had no idea about it. [A] before [B] though [C] as 参考答案:C 答案解析:[解析] 本题考查连词的用法。根据句意来说，后边一句是前边一句的原因，before是介词，表示时间；though“虽然”，表示转折；as表示原因，所以答案为C。[知识拓展] as还可表示“当……时候”
第30题: [单项选择]When the streets are full of melting snow, you can't help but ______ your shoes wet. A. getting B. get C. to get D. got 参考答案:B 答案解析:[试题分析] 词组辨析题，要求了解cannot help but的正确用法。
[详细解答] cannot help but的意思是“不得不”，后面跟动词原形。
