The teacher commanded that the naughty boy but he refused.A. stand upB. stood upC. would

问题补充：

The teacher commanded that the naughty boy , but he refused.

A. stand up

B. stood up

C. would stand up

D. had stood up

答案：

(答案→)A. stand up

B. stood up

C. would stand up

D. had stood up

解析：本题考查command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。