单选题 They worked______ day and______ night and were paid by______ hour.
A. /; /; / B. the; /; the
C. the; the; / D. /; /; the

【正确答案】 D

【答案解析】[解析] 冠词的用法
[解析] 本题中出现了两个习语，一为day and night“日日夜夜，不分昼夜”，二为pay by the hour “按小时计算”。对付这类题仍应平时多加积累，别无捷径。