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_______not to be late for the meeting,we arrived forty minut

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_______not to be late for the meeting,we arrived forty minutes _______ the required time...
_______not to be late for the meeting,we arrived forty minutes _______ the required time,but after _____seemed hours of waiting,we were informed the meeting had been canceled.
  A.So as; ahead of; what  B.In order; ahead of; what
  C.So as; in advance of; it  D.In order; ahead of; it
what和it
请解释用what和it的区别以及相关语法
_______not to be late for the meeting,we arrived forty minut
第一空,为了什么什么,in order to.So as to是只要什么什么的意思.
第二空,表示提前了多长时间,用ahead of.
第三空,what seemed hours of waiting,从句指代a long time.如果用it的话属于句式杂糅.
再问: 能不能具体解释一下 “如果用it的话属于句式杂糅。”
再答: after后面的成分应为名词性质词组或从句,若用it则变成了完整句式破坏了上述要求,属于句式杂糅。