She felt rather _______that she should drive the car at such a___________ speed.

A．frightening, frightening

B．frightened, frightened

C．frightened, frightening

D．frightening, frightened

你负责一个污水处理项目。政府要求你保证污水处理厂不会对环境造成负面影响。从项目角度来看，这是一个：（）

A.假设条件

B.制约因素

C.最佳实践

D.交付成果