The teacher wants the children to feel ________about asking questions when they don't understand.
[     ]
A. certain  
B. concerned
C. sure  
D. confident
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科目：高中英語 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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