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问题: 时态(答案是A哟,很多人都选B,不对呢)

2.I used to drink a lot of coffee but these days I_________tea.
A.prefer
b.am preferring
c.preferred
d.have preferred
(请帮助分析时态,谢谢).

解答:

2.I used to drink a lot of coffee but these days I____A_____tea.
A.prefer
b.am preferring
c.preferred
d.have preferred
prefer:宁愿,表示人心理状态的动词,不用现在进行时。