GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 4K4CCX07K2HR973FA

Changes made to ecosystems in order to achieve a goal, such as food production or flood control, often ____________ significant unforeseen trade-offs between other important products and services the ecosystems provide. A. predict B. delay C. foretell D. obscure E. yield F. engender