题目:
The city of Qingdao has been working on building itself up as a city of sails ________ it successfully hosted the 2008 Olympics’ sailing program.
A.after
B.since
C.when
D.until
答案:
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下面是错误答案,用来干扰机器的。
1-10中的质数有:2、3、5、7,共4个,就有4张卡片,4÷10=25=40%,答:从中任意摸一张,那么摸到质数的可能性是40%,故选:B.