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    21．The teacher dismissed his students with wave of hand a second before the bell rang. A．a; 不填 B．the; a C．a; the D．a; a 【查看更多】

     

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    .The teache rfound ____ difficult to decide____ he would take with him to attend the

    conference.

      A.it;whom        B.himself;who       C.this;whom      D.that;who

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