For some time the expert __________ people of the health risks caused by passive
题型：不详难度：来源：
For some time the expert __________ people of the health risks caused by passive smoking. He says he won"t stop until all the smokers around him decide to quit smoking.| A．is warned | B．is warning | C．has been warning | D．has been warned |
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答案
| C |
解析
考查时态：句意是：有一段时间这个专家一直在警告被动吸烟引起的健康危害，他说知道身边所有的抽烟者都戒烟了他才停止。由此可知警告这个动作是从过去到现在一直在做，而且还要继续，符合现在完成进行时的用法。选C。 |
举一反三
The book came out in 1973 and it _________into thirty languages ever since.| A．translated | B．has been translated | | C．has translated | D．was translated |
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When Alice came to, she didn’t know how long she there.| A．had been lying | B．has been lying | C．was lying | D．has lain |
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— We thought he would have got the job.
— What a pity! He ______too nervous when interviewed.| A．was | B．had been | C．has been | D．would have been |
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After Tom had finished some paper work, he ______ interviewing the applicants.| A．starts | B．had started | C．started | D．has started |
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Henry goes to a free class every Sunday afternoon which______at 4 pm.| A．starts | B．will start | C．is to start | D．started |
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