These students volunteer their time the old men.

A. helps B. help C. to help

C 【解析】句意：這些學生們自愿奉獻他們的時間去幫助這些老人們。helps幫助，第三人稱單數(shù)形式；help幫助，動詞原形；to help動詞不定式形式。根據(jù)句子結(jié)構(gòu)可知，該句已有了謂語動詞volunteer，這個空后的短語表達的是目的，因此應(yīng)用動詞不定式形式，選C。
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