we think the electronic computer()one of the most useful tools in usea.beingb;to bec;be d;have been为什么不是A啊

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we think the electronic computer()one of the most useful tools in usea.beingb;to bec;be d;have been为什么不是A啊

we think the electronic computer()one of the most useful tools in usea.beingb;to bec;be d;have been为什么不是A啊
we think the electronic computer()one of the most useful tools in use
a.being
b;to be
c;be
d;have been
为什么不是A啊

we think the electronic computer()one of the most useful tools in usea.beingb;to bec;be d;have been为什么不是A啊
C
因为所以,科学原理..;P
这个是固定搭配
think sb/sth adj/v(原形)
.为什么不是c阿..

b

C
think后用原形,只有C;be是动词原形