问题
选择题
This well is ______ deep.[ ]
A. six meter
B. six and a half meters
C. six meter and a half
D. six and a half meter
答案
答案：B
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This well is ______ deep.[ ]
A. six meter
B. six and a half meters
C. six meter and a half
D. six and a half meter
答案：B