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    34．The girl was often heard happily in her room. A．sing B．to sing C．singing D．sings 【查看更多】

     

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    The girl was often heard        happily in her room.

    A．sing                 B．to sing             C．singing              D．sings

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    The girl was often heard _______ happily in her room.

    A．sings B．sing C．singing D．to sing 

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    The girl was often heard ________ happily in her room．

    [　　]

    A．sing

    B．to sing

    C．singing

    D．sings

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