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— He has been to the Great Wall many times.
— Is this the reason ____ he gave up this trip?

A. which
B. why
C. what
D. how
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科目：高中英語 來源：廣西自治區(qū)模擬題 題型：單選題

— He has been to the Great Wall many times.
— Is this the reason ____ he gave up this trip?
[     ]
A. which
B. why
C. what
D. how

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