第34题: [单项选择]We've tested three hundred types of boot, ______ is completely waterproof. A. no of which B. some of that C. none of which D. neither of which 参考答案:C 答案解析:[解析] 我们已经测试了三百种靴子了,没有一种是完全防水的。这里空格后是is,单数形式,前面要用否定形式,no of which是错误的,neither是两者选一,只有C正确。