一道初三英语选择题(十九)-How long did it take you to do your homework?-_____A An hour or twoB One hour or twoC An hour and twoD One and two hour我选的是B,结果答案是A,为什么?

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一道初三英语选择题(十九)
-How long did it take you to do your homework?-_____
A An hour or two
B One hour or two
C An hour and two
D One and two hour
我选的是B,结果答案是A,为什么?

A An hour or two (An是指"一个",One指"一")