问题
选择题
| Mr. Smith _____ these days. I think he should take a holiday before he burns out. |
A. has been overworking B. overworked C. had overworked D. was overworking |
答案
答案：A
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| Mr. Smith _____ these days. I think he should take a holiday before he burns out. |
A. has been overworking B. overworked C. had overworked D. was overworking |
答案：A