All the things __were invented in the old days.A.are on display B.are on show C.on display

问题描述:

All the things __were invented in the old days.A.are on display B.are on show C.on display
D.on shows

C
1、on display 或on show 意为“展览,展出”.display 和show 都是原形.
2、本句中,on display 用在主语all the things 后面做后置的定语,译为“展出的所有东西”,谓语是were invented.句子结构已经很完整,因此不能再加 are.