— Could you please do some shopping for me, Mary?
— Sorry, I ______ my homework.         
A．doB．a(chǎn)m doingC．have doneD．was doing
B
當(dāng)別人請你做某事的時候，我們表示拒絕，應(yīng)該是正在做或?qū)⒁鰟e的事，可用進(jìn)行時態(tài)的結(jié)構(gòu)來表示，故本題選B。意思為我正在做作業(yè)。
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