2. 外语
  3. Mr. Black ______ in summer in the lake near his house. But now it is heavily polluted.

Mr. Black ______ in summer in the lake near his house. But now it is heavily polluted.

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问题 Mr. Black ______ in summer in the lake near his house. But now it is heavily polluted.
选项 A、used to swim
B、used to swimming
C、were used to swim
D、was used to swimming
答案A
解析
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