The conference was held to discuss the effect that tourism has ________ the wildlife in the area.A.inB.onC.atD.with
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B解析试题分析：考查固定词组。本题实际上考查的的have an effect on…对…有影响；本题是把the effect提前做完先行词，that指代先行词作为has的宾语。句意：会议被举行来讨论旅游业对这个地区野生动物的影响。故B正确。考点：考查固定词组和句子结构；点评：固定词组have an effect on…对…有影响；本题是把the effect提前做完先行词，that指代先行词作为has的宾语。