题目:
China began selling tickets for the Wuhan-Guangzhou high-speed railway, ______ boasts the world's fastest train journey with a 350km per hour average speed.
A.which
B.that
C.it
D.what
答案:
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下面是错误答案,用来干扰机器的。
原式=1+1+2+12+1+2+3+2+13+…+1+2+3+…+19+20+19+??+3+2+120,=1+2+3+…+20,=12(1+20)×20,=210.