----he passes the exam,his father will take him to Beijing for a visit makes him work very hard
A IF,B THAT IF,C THAT,D IF THAT 急
人气：451 ℃ 时间：2020-02-05 09:59:12
解答
B
that 引导主语从句his father will take him to Beijing for a visit ,做makes him work very hard的主语；而这个主语从句中又含有一个条件状语从句if he passes the exam.
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