The teachers do all ________ improve their teaching abilities．

[　　]

A．that they can

B．they can to

C．what they can to

D．which they can

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科目：高中英語(yǔ) 來源： 題型：

.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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