mother is seriously ill .we must ()a doctor at once .

问题描述:

mother is seriously ill .we must ()a doctor at once .

若是可以填写两个单词,建议写:send for ,表示派人去请(拿),召唤
例如:既然她病得厉害,我们要马上去请医生.
Since she is seriously ill,we have to send for a doctor at once.