21. (单选题) She listened to her favorite rock music while ________ along with the words.( )(本题3.0分) A、 singing B、 sang C、 sing D、 to sing

21. (单选题) She listened to her favorite rock music while ________ along with the words.( )(本题3.0分)
A、 singing
B、 sang
C、 sing
D、 to sing

出自：赤峰学院- 高级英语I(专升本)

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