----Why not John a toy car for his birthday?
----Good idea! He is crazy about cars.
A. buy
B. buying
C. to buy
D. buys
网友回答
(答案→)A. buy
B. buying
C. to buy
D. buys
解析：本题考查动词的用法。“why not…?”结构中，使用动词原形。表示“为什么不……”。句意：——为什么不给约翰一部玩具车为他的生日礼物呢？——好主意！他对小汽车着迷。