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?
问题描述：
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?
答
B．if she will come
soon 本身就是时间状语,故不用when