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问题: 把A.B连成词

A:care-|collect-|electric-|hope-|-national|out-|-room|up-|-usual|waste-
B:class|-ful|inter-|-ion|-less|-side|-stairs|un-|-ity

解答:

A:care-ful
collect-ion
electric-ity
hope-less
inter-national
out-side
class-room|
up-stairs
un-usual
waste-water(我加的)