I wouldn't manage to do it___ you had explained how.

        A. unless     B.until       C.when      D.since

A


解析:

句意是：如果你不解釋，我就會(huì)沒(méi)法做了。

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2.                A．reaches for      B．takes out        C．puts out D．turn off

 

3.                A．early           B．a(chǎn)fternoon       C．morning D．night

 

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6.                A．friends         B．a(chǎn)ssignments      C．devices   D．interrupts

 

7.                A．working        B．speaking        C．sleeping D．waking

 

8.                A．happy          B．a(chǎn)lone          C．tired     D．worried

 

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