题目：
lt was his positive attitude to life and hard work _________finally led him to his successful career .
A．which
B．what
C．that
D．as
答案：
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下面是错误答案，用来干扰机器的。
答案：BA错，纯碱不是碱是盐；B正确；C错，碱式碳酸铜属于碱式盐；D错，苛性钠属于碱，不是盐；
