🔗 前置詞 ・ ヒナ
TOEIC Part5文法問題 ヒナ: Q85（前置詞）
___ arriving at the site, the inspector immediately began the assessment.
___ arriving at the site, the inspector immediately began the assessment.
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正解: A) Upon
What follows the blank is the gerund 'arriving'. 'Upon doing' means 'as soon as doing', which fits the meaning. 'While' is a conjunction that normally takes a clause (while arriving is possible, but it would express simultaneity, not 'as soon as arrival'). 'Since' marks a starting point, and 'during' is a preposition for a specific period — neither is used with a following gerund in this way.