问题
选择题
Plane will be very large _______ flying will be very cheap.
A．and
B．so
C．but
D．or
答案
答案：B
根据前后句子，应该为因果关系，故选B
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Plane will be very large _______ flying will be very cheap.
A．and
B．so
C．but
D．or
答案：B
根据前后句子，应该为因果关系，故选B