7.Which of the things _______ on show yesterday?A.was B.is C.has been D.are

问题描述:

7.Which of the things _______ on show yesterday?A.was B.is C.has been D.are

A. was

yesterday是过去时态的标志

句意:昨天展出了哪些东西?为什么不能选C呢?因为yesterday为过去时间状语,只能同一般过去时连用,不能用于现在完成时.