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 dinnerA come B comes C has come D will come

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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 dinnerA come B comes C has come D will come
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

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 dinnerA come B comes C has come D will come
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.

B.我认为对于我是七岁的儿子来说有他自己的手机是有必要的，因为我有时想确认他是否回来吃饭。选一般现在时表示一种状态

B我认为对于我是七岁的儿子来说有他自己的手机是有必要的，因为我有时想确认他是否回来吃饭

I it think is right it作形式宾语——find/think/belive+形容词/名词/for sb.+to do sth.例句：we all think it necessary to do exercise.关于这个句式,为什么不是it+is+形容词/名词 即：we all think it's necessary to do exercise.此时 it's necess it is not what i think you think but what you think i think you think. I think it is very interesting 是什么意思 i think it is about dreams. I don’t think it is { } coat I think it is my worry too I think it is __________ interesting movie i think it is improssble是什么意思 but I think it is very i think it interesting为什么没有is? i think it is improssble是什么意思 I think,friendship is a________.It can___________. it is too bad.I think (),too. I think it is bad for us It is very cloudy.I think it _________（rain）. I think it impossible 还是 it is mpossible I think it is not anything is possible是什么意思?