◎ 题干
— How about buying Sam a mobile phone? After all, he isn't a boy any more.
— I think it necessary, for we sometimes want to make sure if he _______ home for dinner.
[     ]
A. will come  
B. comes  
C. has come  
D. would come
◎ 答案
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◎ 解析
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◎ 知识点
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