问题
选择题
Jane doesn’t study ___________________ Maria.
A. so careful as
B. so carefully as
C. carefully than
答案
答案：B
题目分析：句意：珍不如Maria学习认真。句中谓语动词是实义动词（study），所以要用副词修饰，排除A；carefully的比较级是more carefully，故排除C；所以此题用原级比较，故选B。