If you sit in a chair _____a long time, your back may begin to hurt.A．atB．inC．on
题型：不详难度：来源：
| If you sit in a chair _____a long time, your back may begin to hurt. |
答案
| D |
解析
| 本题考查介词。介词for 用来引导一段时间。句意：如果你坐椅子很长时间，你的背部可能开始受伤。 |
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