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       we were playing basketball on the playground, it began to rain.
A．WhileB．After
C．BeforeD．Since
A

試題分析：句意：當我們正在操場上打籃球時，開始下雨了。when,當，強調從句的動作發(fā)生時，主句的動作正在發(fā)生。while,強調從句的動作在發(fā)生的過程中，主句的動作發(fā)生了。根據句意，故選A。
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