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the problem is so difficult( ) we can't work it out

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the problem is so difficult( ) we can't work it out
the problem is so difficult ( )we can't work it out the problem is so difficult ( )we can't work out 答案是有一个填as还有一个是填that 想问问这是为什么
第一个是that 第二个是as 相信您肯定见过一下情况.What are you doing?/How are you doing with it?这两句中what问句中没有it,而how问句中有it,因为what用来做宾语,how用来做状语.而题目中,第一句that用来做结果状语从句的连词而已,没有实际意义,所以有it.第二局中用as,做伴随状语/原因状语.