题目内容：
These engines used to _____ (start) by hand. Now they are started by electricity.
参考答案：
答案解析：
单选题：These engines used to _____ (start) by hand. Now they are st
- 题目分类：英语三级B级
- 题目类型：单选题
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A) The man will go alone. B) The woman will go alone.C) They
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