The teacher manded that the naughty boy , but he refused.
A. stand up
B. stood up
C. would stand up
D. had stood up
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(答案→)A. stand up
B. stood up
C. would stand up
D. had stood up
解析：本题考查mand后that从句应用虚拟语气的用法，具体表示为：从句谓语部分用“should(not)＋动词原形”形式，should可以省略。