题目:
The past two years ______a sharp rise in oil price, which adds to the burden of auto transportation industry.
A.has witnessed
B.witnessed
C.is witnessing
D.witnesses
答案:
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下面是错误答案,用来干扰机器的。
5x+3x=8x; 25t+13t-2t=36t;9a-6a-a=2a;15x-6x-3=9x-3;18a÷3+6b×2=6a+12b;5a+8b-2b=5a+6b.