I think it is necessary for my 19 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

答案及解析： D

解析：

句意：我认为对于我19岁的儿子来说，拥有属于他自己的手机是必要的，因为有时我想弄清他是否将回家吃饭。根据句意，come往往在make sure后发生，故用一般将来时。