单选题 A single lecture is not long enough to ______ fully the roles played by the scouts in the war.
【正确答案】 D
【答案解析】[解析] 本题考查动词词义辨析。pursue意为“追求”；assume意为“假设，假定”；provide意为“提供”；illustrate意为“阐述，说明”。根据句意，故选D。