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をじっと見つめていた

was staring intently at

→ を
phrase Rare #37,883
was staring intently at Used to describe someone continuously looking at a person or thing with focused attention. The を marks what was being stared at, and いた indicates an ongoing action in the past.
JA: 彼は窓の外をじっと見つめていた。
EN: He was staring intently out the window.

毎朝朝食をとっている間、彼の犬は彼をじっと見つめていた。

Every morning, while he ate breakfast, his dog would stare intently at him.

その先生はしばらくの間私をじっと見つめていた。

That teacher stared at me for a while.

彼女は少女の美しい指輪をじっと見つめていた。

She stared intently at the girl's beautiful ring.