单选题 Since she was alone, she opened the door ______, leaving the chain lock fastened.

【正确答案】 A

【答案解析】[解析] A选项warily意为“小心地，警惕地”，符合题意。B选项consciously(有意识地，有知觉地)、C选项audaciously(大胆地，鲁莽地)、D选项recklessly(鲁莽地，不计后果地)都不正确。本题的空格处是说她小心地打开门。因此A选项为正确答案。