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    ( ) It is a good time . A. sing B. to sing C. singing D. sang 【查看更多】

     

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    It is a good time _______.

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

     

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    It is a good time _____.
    [     ]
    A. sing
    B. to sing
    C. singing
    D. sang

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    It is a good time _____.

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

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    It is a good time _____.

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

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    It is a good time _______.
    A．sing.B． to sing.C． singing.D．sang.

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