The teacher told us not to take the equipment out of the laboratory until ____________.

  A. allowed to be taken                                 B. allowed to   

C. allowing to take                                      D. allowing to

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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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