2. 外语
  3. They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.

They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.

admin2008-11-13  61
问题 They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.
选项 A、used to
B、hear
C、singing
D、no one
答案B
解析 应改为hearing。Be used to doing是固定结构，表示“习惯做某事”。
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