this is a new tool___people communicate with each othera.whichb.thatc.in whichd.by means of which选a吗?为什么?

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thisisanewtool___peoplecommunicatewitheachothera.whichb.thatc.inwhichd.bymeansofwhich选a吗?为什么?thisisa

this is a new tool___people communicate with each othera.whichb.thatc.in whichd.by means of which选a吗?为什么?
this is a new tool___people communicate with each other
a.which
b.that
c.in which
d.by means of which
选a吗?为什么?

this is a new tool___people communicate with each othera.whichb.thatc.in whichd.by means of which选a吗?为什么?
不是,应该选D,by means of是“通过...”的意思,“人们彼此交流通过这一工具”.如果选A,应该做成分,可是连介词都没有,所以不可以.

个人觉得应该填 by which

B
前面This is a tool已经是个完整的巨资,但后面的巨资是对前巨的解释,应该选that