单选题 He looked behind him to ______ he was not being followed.
A. believe B. find
C. make sure. D. look

【正确答案】 C
【答案解析】[解析] 本题测试词义辨析。make sure：确信，保证。本句的意思是：“他向后看了看，确信没有人跟踪他。”