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用所给单词的正确形式填空oneofthecomesfromSouthAfrica.(science)afterthreestudy,weworkedoutthephysicsproblem.(month)Iwentupstairsandatthedoor.(knock)

题目详情
用所给单词的正确形式填空
one of the ___comes from South Africa.(science)
after three___study,we worked out the physics problem.(month)
I went upstairs and __at the door.(knock)
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答案和解析
scientists months knocked