---Are you ateacher?---No.but I ．A.used toB.usedC.used to haveD.used tobe
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---Are you ateacher?
---No，but I ____．
A.used to
B.used
C.used to have
D.used tobe
试题答案
D
used to be结构中的be不能省略，故选D。
---Are you ateacher?
---No，but I ____．
A.used to
B.used
C.used to have
D.used tobe
D
used to be结构中的be不能省略，故选D。