2. 外语
  3. These engines used to______(start) by hand.Now they are started by electricity..

These engines used to______(start) by hand.Now they are started by electricity..

admin2010-01-09  71
问题 These engines used to______(start) by hand.Now they are started by electricity..
选项
答案be started
解析 engine与start之间是被动关系。
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