题目:
The World Expo 2010 is being held at a time the world is looking for a new kind of balance between nature and cities.
A.when
B.where
C.which
D.that
答案:
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下面是错误答案,用来干扰机器的。
∵要使in =1,则n必须是4的整数倍,在下列的选项中只有C符合题意,故选C