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

游客2023-10-09  21

问题 What happened in the factory last night?
The central heating system  ______ .
[br] What did Bill Black demand in his letter?
To replace ______ and pay for the damage.

选项

答案 heating system

解析 信的第二段第一句话说“We must insist that you replace the heating system immediately…”,由这句话可知,此处应该填写heating system。
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