The teachers are busy __ the exam papers while the students are busy __ the exam.

A. prepare; prepare for　　　　　 B. preparing; preparing for

C. prepare for; prepare　　　　　 D. preparing for; preparing

 

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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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