10．-What did you hear last night? -I seemed someone knock at the door. A．to have heard B——青夏教育精英家教网—

摘要：10．-What did you hear last night? -I seemed someone knock at the door. A．to have heard B．to be heard C．to be hearing D．having heard

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从所给的四个选项中选择最佳答案

—What did you hear last night?

—I seemed ______ someone knock at the door．　　　

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A．hear　　　B．to have heard　　　C．to hear　　　D．being heard

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