单项选择题

________ she joined the company one year ago, she’s already been promoted twice.

A.Although
B.Because
C.If
D.when

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简述ITU-T

答案： G.821建议的误码性能事件和参数的含义
正确答案：ES：误码秒，在1s的时间内有1个或更多的差错比特。

单项选择题

________ she joined ago, she’s already been promoted twice.

A.Although
B.Because
C.If
D.When