By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course．
A．a(chǎn)reB．will have beenC．have been D．will be
B
時態(tài)題。By +將來的時間主句用將來完成時，根據(jù)語境By the time you have completed the essential training,“到你完成基本訓(xùn)練為止”可知還沒完成所以要用將來完成時。句意：到你完成基本訓(xùn)練為止你幾乎會接觸到這門課程的每一項新的特點。選B
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