I’ll let you know as soon as he______

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I’ll let you know as soon as he______
A.is coming back B.will come back
C.comes back D.come back
为什么?

我选C,估计的
A的答案代表的就是说他正在回来,如果选A整句话就会变成当他正在回来我就告诉你,显眼有歧义
B的答案代表的是将来时态,语句不通顺
C和D 的答案就在于C比D多了一个s,按照第三人称来说的话就选C好.
最重要的就是as soon as 的语法
英语动词的时间大致可分为三段：过去时、现在时、将来时.假设有两件事A和B,就会出现三种情况：
A 过去时 as soon as B 过去时
A 现在时 as soon as B 现在时
A 将来时 as soon as B 将来时
在每一个大的时间段内,A 和 B 的时态要统一.比如 A 过去时,B 肯定在过去时内.其它也是如此.至于在每个大时间段内,再根据A 和 B两件事的具体情况,具体对待.比如：A 和B都时过去时,A 和 B 是同时发生,还是先后发生,不是即将发生,再分别选用完成时、进行时、将来时.例如：
A 过去时 B 过去时：
I arranged the flowers in the vase as soon as I came back home.
一回到家里,我就把花在花瓶里插好.
A 过去进行时 B 过去完成时(虚拟)
He was shaking with fright as if he had seen a ghost.
他吓得直哆嗦,就好像看见了鬼一样.
A 将来时 B 将来时(可用一般现在时表达)
They will post me the tickets/post the tickets to me as soon as they receive my cheque.
他们收到我的支票后就立刻把票寄给我.

I’ll let you know as soon as he______ I'll let you know about it as soon as I ( )news a will get b I'll let you know as soon as Tom ___ (return)home. As soon as the result(come)_out,I'll let you know I'll let you know as soon as he —— As soon as the result(come)_____out,I'll let you know.为什么用co I'll let father know as soon as l__(hear)from you I'll let you know as soon as he ——A arrives B will arrive C 改错：I'll let them know as soon as he come bank. 一道英语选择题..._____ you as soon as I know what _____.A、I'll phon i will let you know about it as soon as i ----------- the ne I will let you know as soon as I ______the news(get)