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shallbrowncomeandplaycomputergames?No,hefinisheshishomeworkA.whenB.ifC.unless参考答案是when,我选的是unless,为什么是when,求解释

题目详情
shall brown come and play computer games?No,________ he finishes his homeworkA. when B.if C.unless 参考答案是when,我选的是unless,为什么是when,求解释
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答案和解析
参考答案只是参考的啊,我也觉得是unless 如果要用when,我会写 No, but when finishes his homework. 因为如果就这样用when是一个不完整的relative clause,这样的句子是不通顺的