问题

w buyer identified a dozen new sources for thematerial, ___________ proved to be reliable

A:saw take
B:seen taking
C:seeing take
D:seen taken

正确答案是：

同类题型

下列各句中，没有语病的一项是（）

Winter usually ______ November ______ January.

I always take something to read when I go to the doctor’s________I have to wait.[ ]

gn reads "In case of_______fire,break the glass and push______red button "

Will you waste your time andmoney on that — Certainly ________