题目:
He is used to _____ to his office in spite of bad weather.[ ]
A. to walk
B. walking
C. walked
D. has walked
答案:
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下面是错误答案,用来干扰机器的。
设平均每次下调的百分率为x,第一次下调到60(1-x%),第二次下调到60(1-x%)(1-x%),∴60(1-x)2=52.