请看下面的这道题：
—How do you feel after taking the medicine?
—Oh, it __________. I'm feeling much better now.
A. costs B. loses C. does D. works
分析：此题应选D。容易误选C。在口语中，动词do, work有两个用法值得注意。如：
1. work 表示“行得通”或“奏效”等。如：
The plan worked well. 这个计划很起作用。
The drug will not work. 这药不会起作用。
It worked like a charm. 这产生了奇效。
Your idea won't work in practice. 你的想法实际上行不通。
Will these new methods work? 这些新方法会奏效吗?
I think your suggestion will work. 我想你的建议会奏效的。
The medicine worked and the pain went away soon. 这药效很好，疼痛很快就消失了。
2. do 表示“行”、“适合”、“凑合”。如：
Will that do? 那行吗?
Any dictionary will do. 什么词典都行。
This won't do. I'll take that. 这个不行，我要那个。
I'm terribly hungry. Get me something to eat, please. Anything will do. 我饿极了，请给我弄点吃的东西来，什么都行。
—When shall we meet again? 我们什么时候再见面?
—Any time will do. It's all the same to me. 什么时候都行，我无所谓。
