—How long does Kitty spend on her homework?
— .
A. Half an hour
B. A half hour
C. Half hours
D. An half hour
网友回答
(答案→)A. Half an hour
B. A half hour
C. Half hours
D. An half hour
解析:
试题分析:根据题干how long可知询问的是时间段,又根据选择项的提示可知就是半小时,在英语中半小时的表达方式就是half an hour,故选A。