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----____________when has he started boxing?
----2006, I suppose.
A.InB.SinceC.BeforeD.After
B
主句是现在完成形式,所以选Since。 Since 2006  he has started boxing.
的状语(副词,介宾形式或主语从句)后面跟上一个一般疑问句形式。
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