单选题 I have been trying to quit smoking.
【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 C will build up your resistance. 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"s take up much of your time. 我不会占用你太多的时间。故本题选A。