问题补充：
Please wait here. I’ll be back in hours.
A. two and half an
B. two and a half
C. half and two
D. two a half
答案：
A. two and half an
(答案→)B. two and a half
C. half and two
D. two a half
解析： two and a half hours=two hours and a half两个半小时。
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