the teachers are all very experienced the students have made great prograa in their studies

问题描述:

the teachers are all very experienced the students have made great prograa in their studies
a /...as b as../ c because..so d /..so that 紧急...

选D确定吗?为什么不是a?最开始一个空,the student 之前也是一个空确定,否则不通顺谢谢,so that 在这里解释为因此吧