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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