Theseengines________byhand,butnow

发布时间：2020-07-26 00:41:23

These engines ________ by hand, but now they are started by electricity.A.got used to staringB.were used to startingC.used to be startedD.used to start

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C解析导解：used to do sth. 意为“过去经常做某事”．此句表示过去用手工发动，用被动语态．
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