思いがけなく、スーパーで昔の友達に出会った。
She prides herself on her many accomplishments.
I unexpectedly ran into my old friend at the grocery store.
The verb 'help' takes to-infinitives and bare infinitives but bare infinitives are said to be the most common in casual text; as also used in this example sentence.
思いがけなく
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