练习册

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    The birds are in the sky. A. drinking B. talking C. eating D. flying 【查看更多】

     

    题目列表(包括答案和解析)

    I hear the birds _______.
    A．singB．to singC．singsD．singing

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    I think ______ is necessary ______ us to do something useful to protect the birds.

        A. this; for      B. it; of     C. this; of        D.it;for

     

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    I hear the birds _______.

    A．sing

    B．to sing

    C．sings

    D．singing

     

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    I think ______ is necessary ______ us to do something useful to protect the birds.

    A. this; for        B. it; of           C. this; of         D. it; for

     

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    I hear the birds _______.
    A．singB．to singC．singsD．singing

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