B will have to 主将从现
A 过去肯定不能填
C need在肯定句中只能当实意动词,need to do..
D will know 将会知道,句意不符合.
全句意思：今天的学生必需要知道如何使用明天的电脑,如果他们想要成为科学家的话.
A：had to B：will have to C：need D：will
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