Who studied _____ of the two last year?

问题描述:

Who studied _____ of the two last year?
Who studied _____ of the two last year?
A.the most carefully B.more carefully
C.the more carefully D.carefully
请问这句话是什么意思,应该选哪一个?

C
应是用比较级,carefully 是多音节的单词,比较级一般用前面加more 的形式,二者之前做比较,所以要加the