______finishing his homework ,he went to play basketball.A In B Upon C At DWith

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______finishing his homework ,he went to play basketball.A In B Upon C At DWith
______finishing his homework ,he went to play basketball.
A In B Upon C At DWith

______finishing his homework ,he went to play basketball.A In B Upon C At DWith
B
Upon/On doing sth.
= as soon as 一...(就..)的意思