--- Is your father a teacher of English in No. l Middle School?

--- No. But he ______ English there for ten years.

A．has taught

B．has been teaching

C．taught

D．had taught

对世界重要经济体经济发展趋势和稳定性的判断可以借助相关国家的政府、研究机构和国际组织对一些重要经济指标的预测来进行，这些重要经济指标主要包括？