问题
选择题
How many ______________ are there in the picture?[ ]
A. a bus
B. buses
C. bus
D. some bus
答案
答案：B
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How many ______________ are there in the picture?[ ]
A. a bus
B. buses
C. bus
D. some bus
答案：B
存在，以下关于
的同分异构体