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いただけ

was just (doing something), was only (doing something)

→ 頂く
auxiliary · humble Rare #36,233
was just (doing something), was only (doing something) In these examples, this is いた (the past form of いる) followed by だけ (“only”).
JA: 昨日は家で本を読んでいただけです。
EN: I was just reading a book at home yesterday.
Conjugation of 頂く

トムは写真を撮っていただけです。

Tom was just taking pictures.

ただ貝殻を探していただけだ

I was just looking for seashells.

— レベッカ (1940)

トムさんはまだ学校にいるかどうか考えていただけです。

I was just wondering whether Tom was still at school.

私たちはただ座って、待っていただけだった。

We were just sitting there, waiting.