After experiments on COVID-19，medical experts conclude that the infected person still has the possibility of survival，__________he or she tests positive twice.（ ?。?/h1>
【考點】讓步狀語從句．
【答案】B
【解答】
【點評】
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發(fā)布：2024/5/27 14:0:0組卷：77引用：3難度：0.6
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