— Jack, do you know anything about Doctor Brown? — I _____ to him for years. I don't see how anyone else could do better. [ ]
A.
went
B.
will go
C.
had gone
D.
have been doing
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举一反三
【单选题】_____ is based on information gathered and analyzed about demand and supply. This forecast provides a prediction of short and long term prices and the underlying reasons for those trends.
【判断题】In general, the price of nontraded commodities is determined by world demand and supply conditions , while the price of traded commodities is determined by domestic demand and supply conditions .
【判断题】The value of a currency is determined by the interaction between the demand and supply of that currency relative to the demand and supply of other currencies.