问题描述：
prefer没有时态变化?
I used to drink a lot of coffee but these days I _________ tea.
A.prefer
B.am preferring
C.preferred
D.have preferred
我选了B 因为看到these days 这几天
I used to drink a lot of coffee but these days I _________ tea.
A.prefer
B.am preferring
C.preferred
D.have preferred
我选了B 因为看到these days 这几天
问题解答：
我来补答展开全文阅读