题目内容：

I think it is necessary for my 17-year-old son to have his own mobile phone ,for I sometimes want to make sure if he ------ home for dinner
A come B comes C has come D will come

优质解答

答案：D.我认为对于我那十七岁的儿子来说拥有他自己的手机是必要的,因为我有时想确认他是否要回来吃饭.
if 在这儿引导的是一个宾语从句,其主句时态是一般现在时,根据句意从句要用一般将来时较符合题意.