By the time you have completed the essential training, you exposed to virtually every new feature of the course． A．are B．will have been C．have been D．will be 题目和参考答案——青夏教育精英家教网—

题目内容

By the time you have completed the essential training, you _____ exposed to virtually every new feature of the course．

A．are

B．will have been

C．have been

D．will be

【答案】

【解析】考查时态，by是完成时态的标志，完成时根据by 后面的时态决定，根据句意为可知，By the time you have completed the essential training表示的是将来的时间，意为，在你完成这个重要的培训时，动作尚未发生，因此主句选择将来完成时。

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