20．――Could you go to buy some salt for my? ――Sorry, mum．I my homework．A．a(chǎn)m doing B．will finish C．was doing D．have finished 【查看更多】

 

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——Could you go to buy some salt for me?

——Sorry, mum．I       my homework．

A．a(chǎn)m doing               B．will finish              C．was doing             D．have finished

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