-There lots of wolves in this forest, but now they are endangered.-Yes. Something must be done to protect them.A. used to have B. is used to have C. is used to be D. used to be 题目和参考答案——青夏教育精英家教网—

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－There lots of wolves in this forest, but now they are endangered.

－Yes. Something must be done to protect them.

A. used to have B. is used to have C. is used to be D. used to be

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