A big stepto strengthen China’s health care systems since we launched an effort in 2008.A.

发布时间：2020-08-16 11:13:38

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

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(答案→)A. has been taken
B. is being taken
C. was taken
D. had been taken
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