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1，一些介词或介词短语后面，可以使用动名词。如：
Are you interested in working for us?
这些介词或介词短语包括 in, at, with about, of for in spite of, instead of.
2，before 与 after：
Before going out I phoned Ann.
What did you do after leaving school?
3，by:
You can improve your English by doing a lot of reading.
4，without:
Tom left without finishing his dinner.
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