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填写介词,准确点!we have lived in Beijing __________twenty years.the

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填写介词,准确点!
we have lived in Beijing __________twenty years.
the cat is ill,please send_________a doctor.
david is busy _____________his homework.
i can't tell li _____________his twin brother.
请认真填写,这份东西是要上交的!谢
但我妈说填about,我也不知道该选哪个了,这个问题正在投票中,请几位等候......
填写介词,准确点!we have lived in Beijing __________twenty years.the
for (表示一段时间用)
for(send for派人去请……)
with (be busy with sth 忙于做某事)
from ( tell ...from 区别……)