20．It was only after he had read the papers       Mr．Gross realized the task before him was extremely difficult to complete．（　�。�
A．whenB．thatC．whichD．what

分析 句意：直到他讀了文件之后，格羅斯先生才意識到他面前的任務非常難完成．

解答 答案B．本句為強調句型，句型結構為"It is/was+被強調部分+that+剩余部分．"根據(jù)句意，本題是對時間狀語after he had read the papers的強調．此外，我們也可以將It is/was與空格去掉來驗證此句是不是一個強調句．故選B．

點評 本題考查強調句型，首先要熟悉強調句型的句型結構，其次要了解句子表達的意思，才能選擇出正確選項．

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