请问一下介词后面可以带什么词 eg prep+n./prep+ving还有别的吗?能不能加prep+having done
eg ....with decreasing ----->.....with having decreased (不考虑句意的前提下)
还有就是 43 percent 这类东西,是用it or them?
最后,the number of apples如果我想用介词指代的话,是不是不能指代apples
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