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

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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
单项选择题
Many experts hold the view （） protection awareness is （） the key to better environment lies.

A. that; where
B. which; in which
C. which; where
D. that; in which
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