They were (used to) (hear) him (singing) in a cheerful voice in the classroom wh

游客2025-03-16 5

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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Theywere(usedto)(hear)him(singing)inacheerfulvoiceintheclassroomwh