参考答案

正确答案：C
解析：句意：她倾尽全力也不能让我们改变主意。本题考查的是不定式。不定式在感官动词和使役动词(see, watch，hear，feel，notice，let，have，make等)后面作宾语补足语时;应省略动词不定式的to。例如：She made him act against his own will, 但是当不定式中动词用于被动语态时，动词不定式的to不能省略。例如：He was made to act against his own will。