第1个回答 2015-05-20
go-going
burn-burning
do-doing
sleep-sleeping
read-reading
close-closing
wipe-wiping
clean-cleaning
scratch-scratching
erase-erasing
abrace-abtacing
spit-spitting
walk-walking........
look-looking
watch-watching
speak-speaking
talk-talking
teach-teaching
study-studying
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