discovered
【解析】答案为D。理解句子的意思可知，前面的过去时是虚拟语气现象所导致，所以不
影响宾语从句的时态。后面的意思显然是：迄今为止在科技上的发现。所以用现
在完成时态。
④—What’s that noise?
—Oh, I forgot to tell you. The new machine ________.
A. was tested
tested
【解析】答案为C。根据上文的问话“What’s that noise?”说明回话应该是“机器正在被检测”
所发出的噪声，故选C项。
⑤—I don’t suppose the police know who did it.
—Well, surprisingly they do. A man has been arrested and ______now.
A. has been questioned B. is being questioned C. is questioning D. has
questioned
【解析】答案为B。根据时间状语now可判断出用现在进行时，表示正在发生的动作或存
在的状态。a man是question的动作的承受者，所以要用被动语态，表示正在被
审讯。
⑥He ________as a national hero for winning the first gold medal for his country in the Olympics.
A. regarded
regarded
【解析】答案为B。首先可以判断是被动语态，排除A、C选项。根据句意义“他因为在
奥林匹克里获得了金牌而被认为是国家的英雄。”是“过去”发生而不是“过去的过
去”所发生的事，故选B项。
⑦When he turned professional at the age of 11,Mike_____to become a world champion by his
coach and parents.
A. expected
expected
【解析】答案为C。前面的时间状语从句用的是一般过去时，所以主句也要用过去时态。
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B. will be tested ? C. is being tested D. has been B. was regarded? C. has regarded D. had been B. was expecting C. was expected D. would be