I think it is necessary for my 17-year-old son to have his o

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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 dinner
A 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.

英语15.I think it is necessary for my I think it necessary to do sth.还是 I think it is necessary to I think it is good for me.I think it necessary to…… it后什么时候有 I don't think it is necessary for you to attach great import i think it is necessary for children to communication with p My son is eight year old.改错有没有I think it is necessary to. It is necessary for me to have some help 翻译同义句转换It is not necessary for you to worry about your son‘s s it is necessary to ask for time to think it over i am writing to ask your g____ about my 15-year-old son My son will soon take my place ,()I have worked for ten year