题型:解答题 The great invention he made _____ of great benefit to the whole world.[ ]A. is proved B. has proved C. has been provedD. is proved to be 查看答案
题型:解答题 张先生2年前以每股15元的价格买入1000份股票,2年期间,分红两次,分别是0.3,0.2元,当前张先生以每股18元的价格卖出,则持股收益率()。A.(A) 16.67%B.(B) 20.3%C.(C) 23.3%D.(D) 26.67% 查看答案