单选题 You should do ______ investigations on this matter.
A. farther B. much father C. more father D. further

【正确答案】 D
【答案解析】[解析] 你应就此事作进一步调查。“father”为“far”的两种比较级形式,前者常用于本义“更远”,后者则用于抽象意义“进一步”。例如:I can throw the ball farther than you can.这球我可以扔得比你远。we are not yet near Hudson Bay.We have to go farther north.我们还没有靠近哈德逊湾,还得继续向北走。I’ll give you further details later.以后我将提供给你更多细节。