- I remember there _______ a lot of fish in Yanglan Lake. Now it has been polluted.- What a pity! I think we should pla

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1. - I remember there _______ a lot of fish in Yanglan Lake. Now it has been polluted.
- What a pity! I think we should play a role in protecting the environment.

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

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