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23．--Have you worked out the problem, Sam?--Not yet, but I ．A．didn't B．a(chǎn)m going to C．haven't D．can 【查看更多】

 

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--Have you worked out the problem, Sam?

--Not yet, but I        ．

A．didn't           B．a(chǎn)m going to            C．haven't                   D．can

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