—How do you improve your listening,Mary?—Just ______ listening to tapes,it's a good way,you know.[ ]A.to B.in C.by D.for

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—How do you improve your listening,Mary?
—Just ______ listening to tapes,it's a good way,you know.
[ ]
A.to
B.in
C.by
D.for

C by
表示方式 以什么样的方式

just to 仅仅为了;just in只是在;just by仅仅通过;just for只是用来
综合以上,选c