— Sixteen –year-olds should to drive.A. not be allowedB. be allowedC. not be allowedD. be

问题补充：

— Sixteen –year-olds should to drive.

A. not be allowed

B. be allowed

C. not be allowed

D. be allow

答案：

A. not be allowed

B. be allowed

(答案→)C. not be allowed

D. be allow

解析：句意：十六岁不允许考车。这里表被动，格式为系动词be+动词过去分词，句中有情态动词should，be用原形，结合语意，选C。