问题
选择题
Among the most important questions the journalists wanted _____was how Greece could overcome economic crisis ?
A．to answer
B．being answered
C．answering
D．answered
答案
答案：D
考查非谓语动词。句意“在最重要的问题中，记者想得到回答的是希腊如何克服经济危机。”want sth. done“想让某人被做”，过去分词作宾补。Answer和question是动宾关系，故用过去分词。相当于which was wanted answered。故选D。
股票A与股票B的协方差是（）。