🔤 品詞 ・ アオイ
TOEIC Part5文法問題 アオイ: Q10（品詞）
Our clients appreciate the ___ with which the support team responds.
Our clients appreciate the ___ with which the support team responds.
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正解: C) quickness
The blank sits between 'the' and 'with which', a noun slot. 'The quickness with which...' is a construction using a relative pronoun to mean 'the speed at which...', and 'quickness' is correct. 'Quick' is an adjective, 'quickly' is an adverb, and 'quicken' is a verb — none fit the noun slot after an article. Right before 'preposition + relative pronoun' (with which), the word must be a noun.