题目内容


----____________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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