题干
--Could you help me put up（张贴）the maps on the wall（墙）?
--___________.
A：No problem.
B：I hope so
C：That's all right.
D：That's a good idea.
答案(点此获取答案解析）
A
中，D是AC上一点，联结BD，且∠ABD =∠ACB.