[ TOEFL Grammar ]
He was the only one ___ could solve the problem.
A. which
B. whose
C. who
D. whom
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What’s the rule for using “who” and “whom”?
A. “Who” is always used at the beginning of a question
B. “Whom” is used for formal writing, “who” for informal
C. “Who” is a subject pronoun, “whom” is an object pronoun
D. They are interchangeable in modern English