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Whether - Grammar - Cambridge Dictionary
The Difference between 'If' and 'Whether' | Merriam-Webster
word choice - To determine if or to determine whether?
If or whether ? - Cambridge Grammar - Cambridge Dictionary
determine whether - 英中 – Linguee词典
If or Whether? - Grammar Monster
word choice - When are "if" and "whether" equivalent?
to determine whether-翻译为中文-例句英语| Reverso Context
determining whether - 英中 – Linguee词典
to determine whether | English examples in context | Ludwig