题目内容
A hammer and a feather landed on the surface of the moon ________.
[ ]
A.at once
B.at the same time
C.in the end
D.in a short while
答案:B
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题目内容
A hammer and a feather landed on the surface of the moon ________.
[ ]
A.at once
B.at the same time
C.in the end
D.in a short while