在such … that … (如此……以致……)结构中,that 引导的是结果状语从句.as 用作关系代词,用以引导定语从句,修饰其前的名词problem,as 在定语从句中用作动词 understand 的宾语.因为当先行词受到 such 的修饰时,其后的定语从句应用关系代词 as 来引导,而不用that。
假若在原句的understand后加it,则应该选A.句子应该为This is such a difficult chemistry problem that few students can understand it in class.
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