（2013·新课标Ⅱ卷) 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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（2013·新课标Ⅱ卷) 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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