题目内容
17．If you swim in a river or lake，make clear is below the water surface．（ ）| A． | what | B． | who | C． | that | D． | whoever |
分析 如果你在河里或湖里游泳的话，最好要搞清楚水底下有什么东西．
解答 答案：A．
what意思是"什么"引导宾语从句的时候可以作主语也可以作宾语；who意思是"谁"指人，引导宾语从句的时候作主语；that意思是"那"引导宾语从句的时候，经常起连接作用；whoever意思是"无论谁"引导让步状语从句．根据"make clear is below the water surface"make clear的意思是"弄清楚"后面是宾语从句，空格后面是is，所以空格处需要一个可以作主语的词，所以这句话的意思是"如果你在河里或湖里游泳的话，最好要搞清楚水底下有什么东西．"综上所述，所以要用what来填空，故选A．
点评 首先要掌握句子的意思，然后结合具体的题目，就可以确定正确答案．
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