With the help of high technology, more and more new substances ______ in the pa
题型:不详难度:来源:
With the help of high technology, more and more new substances ______ in the past years.A.discovered | B.have discovered | C.had been discovered | D.have been discovered |
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答案
D |
解析
时态和语态。由句中的时间状语in the past years可知,空格应填现在完成时;又因句子中的主语new substances与discover为被动关系,故选D项。 |
举一反三
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