问题补充:
--Are you a teacher?
--No, but I .
A. used to
B. was used to
C. used to be
D. used to do
答案:
(答案→)A. used to
B. was used to
C. used to be
D. used to do
解析:考查不定式的省略式:英语的不定式的动词上文出现过的话,可以省略to后面的动词,但是be动词或have一般不省,句意:--你是老师吗?--不是,但过去是的,选A。
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