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jack stood there at a loss and he appeared___what his father

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jack stood there at a loss and he appeared___what his father said
A that he had not understood
B not to have understood
选b
a为什么不可以,b为什么对?
appear意为“看起来”,与seem用法大致相同.
通常用法是sb. appear adj./n.
接不定时时助于一定是人,sb. appear to do sth.
接从句时一定要用it作形式主语,it appears (that) .
像这题要是选A得改成It appears that he had not understood what his father said.