题目内容：

I think you should let your parents know all the truth.They appear _____everything.A、to tell B、to be told C、to have been told D、to be telling 选C,为什么啊,B不行么?

优质解答

to be told或者说动词不定式的一般式表达当前或将来的行为或状态,而完成式则表达先于谓语动词或其他与不定式构成意义对比的动词所传达的动作或状态发生,所有选择C而不是B,即“被告知to have been told”是早于“显得appear”.