问题
选择题
| Sixteen-year-old children shouldn't be allowed because they are not serious enough at that age. |
A. drive B. driving C. to be driving D. to drive |
答案
答案：D
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| Sixteen-year-old children shouldn't be allowed because they are not serious enough at that age. |
A. drive B. driving C. to be driving D. to drive |
答案：D