flat做公寓讲时，必须用复数flats形式吗？一栋公寓必须说a block of flats吗？可以说成a flat 吗
网校学员min**在学习新概念英语第二册【随到随学班】时提出了此问题。
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新概念英语第二册【随到随学班】
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Of course, we should arrest
him, but as he has a good record, we shall let him off this time.'哪个是主句 - by then是什么用法，by 是什么词，then是什么词
- a short time before中before的用法
- be of great value中 of great value 是介词短语做表语吗
- and then是什么用法
- After I had given her some money,she looked into a crystal ball and said.中After I had given her some money是条件状语从句吗
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A robot-arm from the Endeavour will grab the telescope and hold it while
the astronauts make the necessary中from the Endeαvour是定语吗 - You must finish your dinner before you leαve the table.这句与主将从现有什么关系？
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As the neighbours complained of the noise, my husband spent weeks
training him to press his paw on the latch to let himself in.中let himself in中in是补语吗 - 主将从现都适用于什么情况，时间状语从句与主句为什么也会遵循这条规则？