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_____ he referred to in his article was difficult to understand.

A. What
B. Which
C. That
D. Who
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科目：高中英語 來源：北京期末題 題型：單選題

_____ he referred to in his article was difficult to understand.
[     ]
A. What
B. Which
C. That
D. Who

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科目：高中英語 來源： 題型：

          he referred to in his article was difficult to understand.

A What                     B. Which                C. That                 D. Who

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