shall brown come and play computer games?No,________ he finishes his homework

shall brown come and play computer games?No,________ he finishes his homework

题目
shall brown come and play computer games?No,________ he finishes his homework
A.when B.if C.unless 参考答案是when,我选的是unless,为什么是when,
答案
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
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