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  3. The Internet celebrated its birthday on September 2nd, by which time 40 years______since the first successful transfer of data b

The Internet celebrated its birthday on September 2nd, by which time 40 years______since the first successful transfer of data b

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问题 The Internet celebrated its birthday on September 2nd, by which time 40 years______since the first successful transfer of data between two computers.
选项 A、has passed
B、had passed
C、passed
D、have passed
答案B
解析
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