单选题
In order to learn the ______ of the family business, Bill took a job
as a mess boy in one of the offices.
A. ins and outs
B. dos and don'ts
C. heads and tails
D. p's and q's
【正确答案】
A
【答案解析】[解析] ins and outs意为“细节”，dos and don'ts意为“注意事项”，heads or tails为掷钱币打赌时用语，意为“你赌正面还是赌反面”，p's and q's主要用于mind one's p's and q's，意为“留意自己的言行”。结合句意，选A最合适。