Plane will be very large flying will be very cheap.A. andB. soC. butD. or

问题补充：

Plane will be very large flying will be very cheap.

A. and

B. so

C. but

D. or

答案：

A. and

(答案→)B. so

C. but

D. or

解析：根据前后句子，应该为因果关系，故选B

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