—the students were sure they would achieve good grades.

问题描述:

—the students were sure they would achieve good grades.
_____,the students were sure they would achieve good grades.
A.Preparing well B.Well prepared
C.Making well preparations D.To prepare well
to choose which one?why?

当前后主语一致的时候,前面的句子能省略主语及be东西.
也就是这句话空里应该是(The students were.)
故答案为B