2. 外语
  3. What happened in the factory last night? The central heating system ______ . What has been done by the heating system supplie

What happened in the factory last night? The central heating system ______ . What has been done by the heating system supplie

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问题 What happened in the factory last night?
The central heating system  ______ .

What has been done by the heating system supplier?
______ has been asked to find out the cause of the accident.
选项
答案A surveyor
解析 回信中的一句话说“We have asked a surveyor to find out the cause of the explosion．”由这句话可知，此处应该填写A surveyor。
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