问题详情：
—Dad, did you tell mother about our gifts for her birthday?
—No. Don’t let the cat out of the bag. Let’s give her a surprise.
A. give her a cat
B. let her know
C. take away the cat
【回答】
B。let the cat out of the bag是常用英语习语, 意为“泄露秘密”, 故B项与画线部分意义相符。
知识点：相似 相近词比较
题型：选择题
