【正确答案】 A

【答案解析】[解析] 画线词quit为动词，意为“停止，放弃”。A项give up意为“放弃，抛弃”；例：After a few tries they decided to give up.试了几次之后，他们决定放弃。B项pick up意为“捡起，学会，接人”；例：We need to pick up on what's going on here.我们需要了解一下这里的情形。C项build up意为“建立，增强，逐步增长”；例：Some vitamin B and vitamin C will build up your resistance.吃些维生素B和C能增强你的抵抗力。D项take up意为“占据，从事”；例：I won't take up much of your time.我不会占用你太多的时间。故本题选A。