TOEIC・英語 大学生・専門学校生・社会人 10ヶ月前

of allのofがなぜこの位置にいるのかがわからないです。 all ofとは訳し方は異なりますか

16. Research indicates that of all the customers - -- register a complaint, 60 percent will return if their complaint is resolved satisfactorily. (A) who (B) whose (C) they (D) what (8) nerff-(0) herW (0)

TOEIC・英語 大学生・専門学校生・社会人 約7年前

教えてください<(_ _*)>わかりません。。

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