Opening the door, Mrs. Summers found family of cats shut in the bathroom.
A. a；不填
B. a; the
C. the; 不填
D. the; the
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(答案→)A. a；不填
B. a; the
C. the; 不填
D. the; the
解析：A 考察冠词。句义：一推开浴室的门，Summersault夫人就发现一群猫被关在里面，a family of一家子，一群；cats在这没有定语限制，表示泛指；易错选B，误把shut in the bathroom当作定语。