----when has he started boxing?----2006, I suppose.A. InB. SinceC. BeforeD. After

发布时间：2020-08-15 01:10:28


----    when has he started boxing?
----2006, I suppose.
A. In
B. Since
C. Before
D. After

网友回答

A. In
(答案→)B. Since
C. Before
D. After
解析：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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