At first she _______ like math ,but now she ________

题目

At first she _______ like math ,but now she ________
如题有4个选项
A did not ,does B does not ,does
C did not ,did D does not ,did

答案

A.
首先可以看出是一个省略句.
以前不喜欢是以前,所以是过去时态,又因为没有合适的动词,所以要用助动词do帮忙,根据事态,应用did,因为后面有but,表示转折,所以应该是不喜欢,应用didn't,但是后来又喜欢了,有now,应该用现在的事态,所以用do