问题
选择题
| A big step _____ to strengthen China's health care systems since we launched an effort in 2008. |
A. has been taken B. is being taken C. was taken D. had been taken |
答案
答案：A
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| A big step _____ to strengthen China's health care systems since we launched an effort in 2008. |
A. has been taken B. is being taken C. was taken D. had been taken |
答案：A