【单选题】
They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.
A.used to
B.hear
C.singing
D.no one
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根据网考网移动考试中心的统计,该试题:
32%的考友选择了A选项
53%的考友选择了B选项
12%的考友选择了C选项
3%的考友选择了D选项