应该是A.
a lot代指很多知识,所以用被动.
by加将来时,用将来完成时.
所以选A
意思是：到这个课程结束的时候,很多关于美国的知识将被学到（你将会学会很多关于美国的知识）.
By the time the course ends,a lot _____ about the United States.
By the time the course ends,a lot _____ about the United States.
A.will have been learned B.will have learned
C.are learned D.have been learned
为什么不选D
A.will have been learned B.will have learned
C.are learned D.have been learned
为什么不选D
英语人气：647 ℃时间：2020-01-28 02:50:13
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