问题

Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.

A:it was invent
B:was it invented
C:it was invented
D:it invented;

正确答案是：

同类题型

Recently, the Chinese government gave some examples of _______ Dalai Lama’s visiting foreign countries had affected China

ground _______ the man, his face aswhite as a sheet of paper.

Keeping healthy, with easy access to affordable medical care, is still a dream for many people, with medicine price rising ________

By was the book

We need some more facts and figures __________ we take the final decision