Planes will be very large flying will be very cheap.A. becauseB. soC. butD. and

问题补充：

Planes will be very large flying will be very cheap.

A. because

B. so

C. but

D. and

答案：

A. because

(答案→)B. so

C. but

D. and

解析：根据题干，本句的意思是“飞机将会很大，因此坐飞机旅行将会非常便宜。”前后句应该是因果关系。所以本题选B。

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