Mary used to take advantage of the lunch hour to have short sleep in her office.A. /; th

问题补充：

Mary used to take advantage of the lunch hour to have short sleep in her office.

A. /; the

B. the; the

C. the; a

D. /; a

答案：

A. /; the

B. the; the

C. the; a

(答案→)D. /; a

解析：考查冠词。第一空是固定词组take advantage of利用…；第二空用a short sleep泛指短时间的睡眠。句意：Mary过去常常连用午饭时间来在办公室里短时间睡一会。故D正确。