单选题
(During) that terrible snowstorm, the police (demanded) that people (stayed off) Highway 101 except (in cases of) emergency.
A、
During
B、
demanded
C、
stayed off
D、
in cases of
【正确答案】
C
【答案解析】
应改为stay off．Demand后面要用虚拟语气，即： (should)+动词原形。
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