Question

By the time when the course comes to an end,( )a lot about computer.

(we'll have learned / we'll learn / we're learning / we have learned) 这题应该选什么，说出正确答案的理由和其他三个选项为什么不选的理由，谢谢啦。。

Answer 1

填
we'll
have
learned
根据句意，the
cours还没有完成，所以the
course
comes
to
an
end
是将来的事情，by+将来每一个时间点，是用将来完成时的标志，所以要用将来完成时will
have
done。
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