we have been informed that he had done __ visits were essent

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we have been informed that he had done __ visits were essential by eleven o'clock last night.
A all B what C that D all that

选B.
主体句式中that引导了第一个宾语从句"he had done __ visits were essential by eleven o'clock last night" ,
选B就会使这第一个宾语从句里又套了第二个宾语从句"__visits were essential " ,
而what在这第二个宾语从句里做主语,成立.
选A是使第一个宾语从句中包含一个定语从句,修饰all visits,但这样定语从句中就会缺少主语（were前面）,而在定语从句中主语是不能省略的,不成立.
选C两个错误,1.that做指示代词时只能修饰单数名词 2.定语从句中仍然缺少主语
选D句式混乱,改为.he hade done all visits that were essential.则正确,这时all visits做宾语,that were essential成为定语从句修饰宾语,即做宾补.

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