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 passedB．had passedC．passedD．have passed
B
考查時態(tài)，by which time引導(dǎo)定語從句，by+過去時間，謂語用過去完成時，句意是：互聯(lián)網(wǎng)在九月二日慶祝了自己的生日，到這個時間時間為止自從兩臺計算機(jī)之間的第一個成功的通過的數(shù)據(jù)傳輸已經(jīng)過去有40年了。選B。
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