She is in a poor ______of health, which worries her mother much.
A.position
B.situation
C.state
D.condition
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C解析state [C] condition in which a person or thing is （in mind , health, etc ）状态.情形；position: 位置.情势；situation: set of circumstances or state of affairs, esp. at a certain time 状况，处境；condition [U]:physical fitness, health 健康状况。冠词a决定了此题只能用 C。