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----____________when has he started boxing?

----2006, I suppose.

A. In                B. Since              C. Before             D. After

B


解析:

主句是現(xiàn)在完成形式,所以選Since。 Since 2006  he has started boxing.

的狀語(副詞,介賓形式或主語從句)后面跟上一個一般疑問句形式。

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