题目

_______ was leisure generally considered a waste of time. A. Not until recently        B. Not recently       C. Until recently     D. Recently until   答案:A  考查连词以及倒装。Not until“直到……才”。  已知a+b=-1,ab=-1,则a2+ab+b2的值是(  ).A.2-B.3-C.2-2D.4-2
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