很明显他们根本没为考试做过准备。
It is obvious that they didn't prepare for the exam at all.
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is英 /ɪz/|美 /ɪz/
obvious英 /ˈɒbvɪəs/|美 /ˈɑbviəs/
that英 /ðæt/|美 /ðæt/
解释
It is + 形容词 obvious + that 引导从句，用形式主语结构表达从句内容的显而易见。
It is obvious that they didn't prepare for the exam at all.
It is + 形容词 obvious + that 引导从句，用形式主语结构表达从句内容的显而易见。