16. There was so much noise produced by the machine outside that the professor had to ______ his voi

题目简介

16. There was so much noise produced by the machine outside that the professor had to ______ his voi

题目详情


16. There was so much noise produced by the machine outside that the professor had to ______ his voice so that it would not ________.
A.rise; be drownedB.lift; drownC.increase; drownD.raise; be drowned
题型:单选题难度:偏易来源:不详

答案

D

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