Question

(2011·北京東城綜合練習(xí))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

Answer 1

答案：A

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