高中英语X1

一楼的回答很正确，这样转换一下就可以了， he bought the T-shirt cheap=he bought a cheap T-shirt ,这里的cheap是用来修饰衣服的价格便宜，不是指买东西的这个动作。

选A是指T-shirt便宜
选B是指他买这件T恤的行为便宜

我也感觉选b

buy something cheap 以便宜的价格买某物，固定搭配

在 buy, sell, hire someone 的情况下，用cheap

但其他的动词，比如 travel cheaply by air, play basketball cheaply

都是用cheap 的 副词

cheap adv (infml 口)
1 for a low price 廉价地: get sth cheap 廉价买到某物 * sell sth off cheap 廉价卖出某物.
2 (idm 习语) ,go `cheap (infml 口) be offered for sale at a low price 廉价卖: The local shop has some radios going cheap. 本地商店有些廉价的收音机.
cheaply adv 1 for a low price 廉价地: buy, sell, get sth cheaply 廉价买、 卖、 得到某事物. 2 in a cheap(1a) manner 廉价地; 便宜地: The room was cheaply furnished. 屋里配置了便宜的家具. 3 (idm 习语) get off lightly/cheaply => lightly

只能用形容词形式，这里是形容词做状语，可以表示原因、伴随、条件等等。
eg: 他们回到家了又累又饿。
They got home, tired and hungry.