单项选择题

The Internet celebrated its birthday on September 2nd, by which time 40 years （） since the first successful transfer of data between two computers.

A. has passed
B. had passed
C. passed
D. have passed

<上一题 目录 下一题>
热门 试题

单项选择题
I haven’ t seen Johnson these days. ---I think she （） a conference in Beijing, but I’ m not sure.

A. should be attending
B. might be attending
C. could have attended
D. must have attended
填空题
A. group B. about C. found D. without
相关试题