When I heard the cry for help _______ ,I ________quickly to help him.A in downstairs,ran to downstairsB downstairs,ran downstairsC on downstairs,ran to downstairsD downstairs,ran to downstairs

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When I heard the cry for help _______ ,I ________quickly to help him.
A in downstairs,ran to downstairs
B downstairs,ran downstairs
C on downstairs,ran to downstairs
D downstairs,ran to downstairs

B downstairs为副词 副词前面省略介词

答案是选B,downstairs词性是adv.