He will spend six hours at his desk _______ he finishes his composition.A．beforeB．untilC．afterD．whe

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• He ran off____ I could stop him.A．beforeB．afterC．sinceD．when-英语
• She was looking for her bicycle key _______ she thought she might have put it.A．whereverB．wheneverC．
• As we have planned, we’ll go to Beijing to attend her sister's wedding party. We'll also v
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• —What should we pay more attention to if we go north in winter, Mum?—Nothing much. Take warm clothe
• It looks ____ it's going tosnow.A．thatB．asC．as ifD．like that-英语
• everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as
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• He was told that it would be at least three more months______he could recover and return to work.A．w
• ____ we can’t remove our troubles in life for ever,we can leave them behind when we are on vacation.
• The job is open to all,their previous experience.A．apart fromB．as a consequence ofC．regardless ofD．i
• John did the task____ his sister.A．as good asB．as better asC．as well asD．as best as-英语
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• Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,_
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• 分解因式：2a3b﹣4a2b2+2ab3=（）．-八年级数学
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• （1）因式分解：16a4﹣8a2+1；（2）计算：9999×10001．-七年级数学
• 因式分解：（1）x2+5x+6；（2）ac﹣bc+3a﹣3b．-七年级数学
• 下列多项式中，能够因式分解的是A．a2+b2B．x2﹣xy+y2C．p2﹣6p+9D．﹣m2﹣n2-七年级数学
• 分解因式3x3﹣12x2y+12xy2=﹙﹚．-七年级数学
• 下列多项式中，不能进行因式分解的是[]A．-a2+b2B．-a2-b2C．a3-3a2+2aD．a2-2ab+b2-1-八年级数学
• 如果a2+b2+2c2﹣2bc=0，则a+b的值为[]A．0B．1C．﹣1D．不能确定-七年级数学
• 分解因式﹣2a+a4的结果是[]A．﹣a（2﹣a3）B．2a（1﹣a）C．﹣2a（1﹣a）D．﹣2a（1+a）-七年级数学
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