问题描述:
The plane is flying in the sky.
The plane is flying_____.
A.in the sky
B.in the air
C.in space
D.in sky
正确答案是A,为什么?B不可以吗?
The plane is flying_____.
A.in the sky
B.in the air
C.in space
D.in sky
正确答案是A,为什么?B不可以吗?
问题解答:
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