情态动词的用法
He did very badly on the exam. He ___harder.
A.must study B.must have studied C.should study D.should have studied
本题答案选D，AC为什么错误呢，不能表示之后他必须或者应该好好学习吗？肯请老师解答，感谢！
最佳答案 2021-10-19 11:59
原句介词用错，把on 改为 in。
A、C两个答案不是不可以，如果加上 in the future 的话。例如：
He did very badly in the exam. He should have studied harder.
He did very badly in the exam. He should study harder in the future.
He did very badly in the exam. He must study harder in the future.
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