单选题I don’t know   

问题补充：

单选题Idon’tknow.Whenhe.Iwillphoneyou.A.when will be some back, comes backB.when is he coming back, will come backC.when he comes back, is coming backD.when he is coming back, comes back

答案：

D解析此题重点考查when引导宾语从句和时间状语从句的不同。前者要用陈述句语序，且时态要和主句保持一致；后者常用一般现在时。