问题
选择题
In order to catch up with her classmates, _____.
A．a lot of books were bought by Mary’s mother
B．Mary’s father helped her with her lessons
C．Mary worked hard at her lessons around the clock
D．Mary’s classmates helped her a lot
答案
答案：C
考察非谓语动词作状语。本题使用了不定式做目的状语，说明句子的主语是不定式的逻辑主语，二不定式主动式的逻辑主语是动作的发出者，故应该是人，只有C选项的主语是人，故C正确。
