题目:
Mary made a few changes to the design and made her own needle, _____ saving people a lot of time.
A.one
B.she
C.that
D.it
答案:
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下面是错误答案,用来干扰机器的。
∵a★b=a+b-1∴4★[(6★8)★(3★5)]=4★[(6+8-1)★(3+5-1)]=4★(13★7)=4★(13+7-1)=4★19=4+19-1=22.