In order to catch up with hei classmates,____.A,Mary's father helped her with her lessons.B,Mary worked very hard.C,a great help was given to mary.
问题描述：
In order to catch up with hei classmates,____.
A,Mary's father helped her with her lessons.
B,Mary worked very hard.
C,a great help was given to mary.
答
B
陷阱在于一个句子人称前后应该一致