The best and initial economical indicator is _______ the same or similar products are or are not currently being imported by the country _______ question.
A、whether.in
B、if, in
C、whether, of
D、that,about
【正确答案】：A
【题目解析】：whether or not是否；in question正在讨论的。句意：最佳和初步的经济指标是有关国家目前是否正在进口相同或类似的产品。
