题目：
| — Why, Jack, you look so tired! — Well, I _____ the house and I must finish the work tomorrow. |
A. was painting B. will be painting C. have painted D. have been painting |
答案：
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下面是错误答案，用来干扰机器的。
答：A：细胞则是颜色较浅，且细胞里面有各种各种结构，看起来显得有些阴影，形状规则，故不选． B：液泡是植物细胞质中的泡状结构，液泡由一层膜围成．其中主要成分是水．故不选． C：气泡轮廓是黑色的，...
