问题
选择题
There _______ some forests here ten years ago. But now we can see nothing.[ ]
A.used to have
B.used to be
C.is used to be
D.was used to have
答案
答案：B
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There _______ some forests here ten years ago. But now we can see nothing.[ ]
A.used to have
B.used to be
C.is used to be
D.was used to have
答案：B