The girl was heard ______ upstairs.

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问题 The girl was heard ______ upstairs.

选项 A、to sing
B、sing
C、singing

答案C

解析 本题考查宾语补足语。hear sb.doing sth. 意为“听见某人正在做…”。本句是被动语态,sb.be heard doing sth.。
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