By the time the course ends,a lot _____ about the United Sta

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

xpd1024 1年前已收到3个回答举报

鸟菜250 幼苗

共回答了15个问题采纳率：86.7% 举报

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）.

1年前

睡美豚幼苗

共回答了3个问题举报

是A嘛```?

1年前

半姆幼苗

共回答了41个问题举报

by 与时间状语连用时，意思为:到什么进为止，一般都用完成时态

1年前

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