问题补充：
Mother insisted that the childs hands before dinner.
A. should wash
B. be washed
C. had been washed
D. would be washed
答案：
A. should wash
(答案→)B. be washed
C. had been washed
D. would be washed
解析：wash和hands之间构成动宾关系，hands作了that从句中的主语，所以谓语需用被动结构。insist作“坚持（某种观点或看法）”讲，后面宾语从句的谓语动词用虚拟语气，即should+动词原形，should可以省略。
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