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.

admin2015-04-17  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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