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  3. ______I was trying to do is to persuade my brother to give up smoking.

______I was trying to do is to persuade my brother to give up smoking.

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问题 ______I was trying to do is to persuade my brother to give up smoking.
选项 A、That
B、Now
C、What
D、Which
答案C
解析 分析句子结构可知，is之前是主语从句。从句中成分不完整，缺少do的宾语，所以应用连接代词what。故选C。
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