English!帮忙加个介词````他靠买房子发了财He made a fortune( )selling houses.

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English!帮忙加个介词````他靠买房子发了财He made a fortune( )selling houses.
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English!帮忙加个介词````他靠买房子发了财He made a fortune( )selling houses.
English!帮忙加个介词````
他靠买房子发了财
He made a fortune( )selling houses.

English!帮忙加个介词````他靠买房子发了财He made a fortune( )selling houses.
by表示通过什么方式

He made a fortune( in)selling houses

by

应该是in
他卖掉了那座房子赚了很多钱