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.

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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.
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.

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.
---宇航员正在探索外部空间,真令人惊讶!----我想那是一种挑战.
that astronauts are exploring outer space主语从句,it是形式主语,代替上面的主语从句.How amazing it is...是个感叹句.

A

宇航员探测太空是多么让人惊讶的事---我猜它也是很难的!