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    The other day I was showing the boys the weekly chemistry experiment when, I knew it, the mixture was bubbling over everywhere. A．if B．before C．though D．unless 【查看更多】

     

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    .The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.

    A．if

    B．before

    C．though

    D．unless

     

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    .The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.

         A．if          B．before      C．though         D．unless

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     The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.

       A．if             B．before         C．though         D．unless

     

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