单选题 Whenever we hear of a natural disaster, we feel sympathetic to the people to be affected.
A. to have affected B. to have effected
C. who have been effected D. who have been affected

【正确答案】 D

【答案解析】[解析] 时态应用。
动词不定式短语常表示将来要发生的动作，与本题意思不符，因而排除A、 B。题干中people后的affect表示“影响，侵袭”应该用被动式。effect做动词用时表示“招致，实现，达到(目的等)”，表示“影响”时是名词：The drug had an immediate effect on the pain．这药对止痛能立刻生效。