问题描述:
80.— How amazing it is that astronauts are exploring outer space!— It’s a challenge,I guess,
A.of B.for C.by D.about
请翻译、并详细分析,越详细越好.
A.of B.for C.by D.about
请翻译、并详细分析,越详细越好.
问题解答:
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