The nursing staff are exhausted; they’ve been______all weekend.A、on callB、on gu

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问题 The nursing staff are exhausted; they’ve been______all weekend.

选项 A、on call
B、on guard
C、on line
D、on patrol

答案 A

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在岗，警惕。on line排队。on patrol在巡逻中。

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—I’msorryIsteppedoutsideforabreathoffreshair.Iwassoexhausted.—The