单选题The nursing staff are exhausted; they’ve been ______ all weekend.Aon callBon guardCon lineDon patrol

单选题
The nursing staff are exhausted; they’ve been ______ all weekend.
A

on call

B

on guard

C

on line

D

on patrol


参考解析

解析:
句意:这些保育员已忙得精疲力竭了,整个周末他们都是随叫随到。on call随叫随到的,待命的。on guard在岗,警惕。on line排队。on patrol在巡逻中。

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