I'll let you know as soon as he____ back.

I'll let you know as soon as he____ back.
A、 will come
B、 comes
C、 should come
D、come
【正确答案】：B
【题目解析】：考查 as soon as的用法及时态。 as soon as引导时间状语从句,表示“就…”,主句用一般将来时,从句用一般现在时。所以,选B【参考译文】他一回来我就告诉你。