Although Osaka has added generating capacity______its power meltdown in 2010, tr

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问题 Although Osaka has added generating capacity______its power meltdown in 2010, transmission bottlenecks remain.

选项 A、yet
B、ever
C、since
D、without

答案 C

解析语法：介词1．空格后需要填入一个介词修饰名词its powermeltdown，since意为“自从……”，因此(C)为正确选项。2，A选项yet作副词时意为“还未……”、 “已经”，作连词时意为“尽管……”.

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