(2011·北京東城綜合練習)By the time you have completed the essential training，you ________ exposed to virtually every new feature of the course.

A．will have been  B．a(chǎn)re

C．have been       D．will be

答案：A

解析：By the time sb. has done sth.后的主句用將來完成時will have done。

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