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