I'll give him your message at once [ ] he comes back from lu

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I'll give him your message at once [ ] he comes back from lunch.
A when B if
这题相信不会难倒大家的,希望你们能帮我选出正确的答案及其原因,
这是一道单选题，大家的回答都不同，你们这样让我很难做哦。

选A,从语法上来讲主句用将来时从句用一般现在时if引导的条件状语从句和when引导的时间状语从句都可以.但从句意理解上,A更好些.
表示：他一回来我就告诉他.
B表示如果他回来我就告诉他,揣摩出题人的意图,应该是A.
将来时+when不知道是不是什么固定用法.

I'll give him your message at once [ ] he comes back from lu I'll give him your message__he comes back from lunch . 语法专练：单项选择：1,I’ll give him your message at once ___________ I will give you him message before he comes back for lunch. ( )71.I’ll tell him to give you a call____ he comes back. I'll tell him about it ()he comes back He comes back.I'll tell you at once.改为条件状语从句格式：I ___ ___ yo As soon as he comes back,I'll tell him when（）and see him.A. As soon as he comes back,I’ll tell him when ___ and see him. [As soon as he comes back,I'll tell him when__and see him.] As soon as he comes back,I'll tell him when____and see him. As soon as he comes back,I'll tell him when ____and see him.