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  3. ________I am trying to do is to persuade my elder brother to give up smoking.

________I am trying to do is to persuade my elder brother to give up smoking.

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问题 ________I am trying to do is to persuade my elder brother to give up smoking.
选项 A、That
B、When
C、What
D、Which
答案C
解析 分析句子结构可知，is之前是一个主语从句。从句成分不完整，缺少do的宾语，所以应用连接代词what引导。that引导主语从句时，在从句中不充当任何语法成分，只起连接作用且无词义；when在主语从句中作时间状语；which在主语从句中作主语、宾语等成分，且有选择含义，这三项均不符合题意。故选C。
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