作业帮She didn't know back soonA weather he would beB if he will come
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She didn't know back soonA weather he would beB if he will come
She didn't know back soon
A weather he would be
B if he will come
She didn't know back soonA weather he would beB if he will come
if 引导的从句不能放在否定之后.所以选A
A
这是一个宾语从句，从句除了表示客观规律以外（例如She said that the earth moves around the sun),从句中的谓语动词的时态要与主句中的谓语动词时态一致。
这道题中主句中的谓语动词是did用的是过去时，所以从句中的谓语动词时态也要用过去时。
A