-There ______ many trees at the foot of the mountain. --But now they are slowly disappearing because...
2022-12-24 04:09:29 24次 2015年初中毕业升学考试（青海卷）英语（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
-There ______ many trees at the foot of the mountain.
--But now they are slowly disappearing because of human activities.
A.is used to
B.used to
C.used to be
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