39. is certain, people’s living conditions in China have improved a lot since the 1980s.A

发布时间：2020-08-16 07:37:16


39.      is certain, people’s living conditions in China have improved a lot since the 1980s.
A. It
B. As
C. what
D. Which

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A. It
(答案→)B. As
C. what
D. Which
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