—Is it necessary to look up every new word when I come across it in reading?

—No. You ________， because you are likely to guess the meaning from the context.

A．can't

B．mustn't

C．don't have to

D．ought not to

影响绩效的主要因素有（）

A、技能、激励、环境、机会

B、知识、技能、态度、能力

C、任务、环境、领导、机会

D、学历、经验、能力、机会