题目内容
15．他们想知道明天是否会下雨oThey want to knowif/whetheritwill rain tomorrow．
分析 if/whether it
解答 答案：if/whether it；
通过对比，可知英文句子缺少"是否"的表达；根据They want to know 可知后面跟的是宾语从句作know的宾语；"是否"应该用连接词if/whether；后接从句，所以在谓语动词will rain前应该为主语，这里用it来代指天气．故填：if/whether it
点评 此题考查宾语从句的用法．做此题的关键是联系句意确定好连接词，再使用从句正确的主语形式．
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