his homework, my son went downstairs to play basketball. 
A．Having finishedB．finishedC．to finishD．finishing
A
考查非謂語(yǔ)動(dòng)詞作狀語(yǔ)。my son與finish之間是主動(dòng)關(guān)系，且分詞的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞之前，故用現(xiàn)在分詞的完成式，所以選A，句意：我的兒子完成作業(yè)之后他就去樓下打籃球。
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