B
长句中间的部分,“as most classmates had expected”是插入的修饰语,可以不看,句首的长句整体构成最后一句“made her parents very happy.
”的主语.
实际上就是“Mary being chosen as the best student in her college made her parents very happy.”
A的话,单独构成了一句话,是不能做整个句子的主语的.
B
长句中间的部分,“as most classmates had expected”是插入的修饰语,可以不看,句首的长句整体构成最后一句“made her parents very happy.
”的主语.
实际上就是“Mary being chosen as the best student in her college made her parents very happy.”
A的话,单独构成了一句话,是不能做整个句子的主语的.