A.He had planned to attend Jason's presentation but couldn't. B.He preferred Jason's previous presentation. C.He'd like to do the next presentation himself. D.Jason won't give any more presentations.
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参考答案:
举一反三
【简答题】已知两条直线l 1 :ax+3y-3=0,l 2 :4x+6y-1=0.若l 1 ∥ l 2 ,则a=______.