She felt pletely during the vacation but now she has to go back to her work again.
A. at sea
B. at ease
C. at a loss
D. at risk
网友回答
A. at sea
(答案→)B. at ease
C. at a loss
D. at risk
解析：考查介词短语。A=C茫然，不知多措；B舒适(地)，安逸(地)；D处于危险中；根据上下文句意可知B正确。句意：在假期中 她感觉很舒适，但是现在她又工作了。