They were waiting _____ the station _____ twenty minutes.
- Of - at
- At - for
- In - UpTo
- None of these
Explanation
"At the station": Indicates the location where they waited.
"For twenty minutes": Specifies the duration of waiting.
Use "at" for general locations (e.g., at the park, at home).
Use "for" to indicate duration (e.g., for hours, for days).
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