题目内容
16．---What about going to the South Lake for a picnic next weekend？---OK．But I'm not sure _______ it will rain．（ ）
| A． | why | B． | where | C． | when | D． | whether |
分析 --下周末去南湖野炊怎么样？--好的．但是我不确定是不是下雨．
解答 答案：why意思是"为什么"；where意思是"在哪里"；when意思是"什么时间"；whether意思是"是否"．根据"I'm not sure"以及"it will rain"可知，对于明天是否下雨是不确定的．所以要用whether，故选D．
点评 首先要掌握这几个连词的意思以及用法，然后结合给出的具体语句，就可以确定正确答案．
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