单选题The nursing staff are exhausted; they’ve been _______ all weekend.Aon call Bon 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：
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站岗，警惕。on line排队。on patrol在巡逻中。
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站岗，警惕。on line排队。on patrol在巡逻中。
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