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のは明らかだった

it was clear that

→ の
phrase Rare #33,510
it was clear that Follows a clause to say that something was obvious or clear.
JA: 彼が疲れているのは明らかだった。
EN: It was clear that he was tired.

解決策がないのは明らかだった。

It was obvious that there was no solution.

それでも、屋根を新しくする必要があるのは明らかだった。

Even so, it was clear that the roof needed to be replaced.

彼がそこへ行ったのは明らかだった。

It was clear that he had gone there.

隠そうとしていたが、彼女がひどく動揺しているのは明らかだった。

She tried to hide it, but it was obvious she was deeply upset.

彼女がその犯罪に関係しているのは明らかだった。

It was clear that she was involved in the crime.

まだ水深は十分あるのは明らかだった。

It was clear that the water was still deep enough.