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Do you know ________ back soon?A.when she will come B.if she will come 此题应该选什么?为什么?

题目详情
Do you know ________ back soon?A.when she will come B.if she will come 此题应该选什么?为什么?
▼优质解答
答案和解析
B.if she will come
soon 本身就是时间状语,故不用when