He is the only one of the students who ______ the answer.
Answer and explanation
Correct answer: C. knows
- Step 1: 關係代名詞 who 的先行詞是 the only one（單數），動詞用單數 knows。
- Step 2: 此為易錯題：不要被 students 誤導。
Answer
knows.
Why not the others: know、knowing、to know不符合題意。
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