The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen
题型:不详难度:来源:
The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.A.to be invented | B.having been invented | C.invented | D.to have been invented |
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答案
D |
解析
本句考查动词的被动语态和时态,it+is+动词ed形式,to do是固定的搭配用法。而Bunsen Burner的发明是过去发生的动作,所以用完成时态。 |
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