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