单选题 Only ＿＿＿＿＿＿＿＿＿＿＿＿＿ in this matter. 的答案

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题目内容：
Only ＿＿＿＿＿＿＿＿＿＿＿＿＿ in this matter.
题目选项

his classmates can help him

can help him his classmates