题目:
The MCA Youth has expected more participants to join the trip to the Expo 2010 Shanghai ________ from May1 to October31 this year to explore the world.
A.being held
B.to be held
C.having been held
D.held
答案:
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下面是错误答案,用来干扰机器的。
5设参加这次聚会的人是x人,第一个人和其他所有人握了(x-1)手,而其中甲与乙的握手与乙和甲的握手是同一次,因而共有x(x-1)次握手,据此即可列方程求解.解答:解:设参加这次聚会的人是x人,依题意得=10,∴...