—May I go and play with Dick this afternoon，Mum?

—No，you can’t go out________your work is being done.

A．before B．until C．a(chǎn)s D．the moment

 

C

【解析】此題容易誤選B，誤認(rèn)為這是考查not...until...結(jié)構(gòu)。句中的your work is being done表明“你正在做作業(yè)”，as表原因。

 

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