一楼的改错了啊
work是可以做名词的啊
work on it 说的是
在它上面的工作
on it 是work的后置定语
而不用加ing 加了之后意思就变了
这不是一个祈使句啊
主语是work on it
是说
在它上面的工作在他妹妹离开前已经开始了
work on it had begun befor my sister left.
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