In the free online video, the expert explains______you need to know about becomi

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问题 In the free online video, the expert explains______you need to know about becoming a successful trader.

选项 A、what
B、which
C、where
D、how

答案 A

解析语法：连接代词1．选项均为可引导宾语从句的连接代词和连接副词。2空格内应填入一个名词作及物动词know的宾语。因此(A)what为正确选项。3．当know缺少宾语，空格后句子成分不完整时，what引导的名词性从句可以充当前面及物动词的宾语。

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