(2013·新课标Ⅱ，10)It was only after he had read the papers________Mr.Gross realized the task before him ...
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题目内容：
(2013·新课标Ⅱ，10)It was only after he had read the papers________Mr.Gross realized the task before him was extremely difficult to complete.
A．when B．that C．which D．what
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