【正确答案】 D

【答案解析】[题解] 本题是有关具体的一个单词facilitator：one who acts to help or make sth．easy/easier。如果没弄懂单词意思，可以根据上下文来推理猜测。Their prime task is to grab attention, help make sure that the activities are interesting and provide background information, which helps students to actively participate in the lesson and plan and implement effective, complimentary home study programs．