问题
选择题
My father is usually on _______ duty in his office every _______ few days.
A.the;a
B./; /
C./;a
D.a; /
答案
答案:B
考查冠词的用法。句意“我爸爸每几天就在办公室值班。”on duty“在值班”;every few days“每几天”。every“每......”,后不与冠词连用。故选B。