You'd better send _ the doctor at once.填介词.

问题描述:

You'd better send _ the doctor at once.填介词.

for 派人去请的意思

off
寄出, 邮寄,发送,派遣, 解雇, 给...送行

for
send for
召唤,派人去叫;派人去拿
eg:Let us first send for two soldiers," said the governor.
“请等一下,我们先派两个士兵去,”*长说.

for
send for 派人去叫、