----____________when has he started boxing?----2006, I suppose.A．InB．SinceC．Befo

题型：不详难度：来源：

----____________when has he started boxing?

----2006, I suppose.

A．In

B．Since

C．Before

D．After

答案

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。

举一反三

Tom shut everybody out of the study ___ he could prepare for the coming exam.

A．which

B．when

C．so that

D．as if

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A．When	B．While
C．Unless	D．Until

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A．so that	B．as long as
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—There is no doubt about it.

A．that

B．which

C．while

D．where

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A．in case	B．even if
C．unless	D．when

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