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问题: 大学英语2 阶段作业1 问题48 要详细解释

48、It is necessary that we ___ work hard at college.
A、must
B、have to
C、should
D、ought to

解答:

C、should
It is necessary that 后面应该接虚拟语气,形式为 should + do(should可以省略)!