回答
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I was looking away so I didn't see what happened.
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I wasn't paying attention so I didn't notice anything.
1) I was looking away so I didn't see what happened.
「よそ見していて何が起こったか見なかった。」
2) I wasn't paying attention so I didn't notice anything.
「よそ見していたので何も気付かなかった。」
「よそ見する」は
look away や
not paying attention
と言えます。
ご参考になれば幸いです!