题目内容

It happened while I _____ in Rochester.

A. am living
B. live
C. was living
D. will live

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Don't disturb him now -- he is _____.

A. working
B. work
C. been worked
D. worked

They _____ outside for two hours.

A. wait
B. waited
C. have been waiting
D. are waiting

差分机的研制者是()。

A. 约瑟夫•雅各
B. 赫尔曼•霍勒瑞斯
C. 巴贝奇
D. 帕斯卡

标志着电子计算机时代到来的计算机,简称是()。

A. ENIAC
B. EDSAC
C. EDVAC
D. Mark-I