单选题
Although they had only been invited for lunch they ______ till suppertime.
A、
stayed out
B、
stayed on
C、
stayed up
D、
stayed off
【正确答案】
B
【答案解析】
stay on继续呆下去；stay up熬夜；stay off离开，远离；stay out呆在户外，不在家。句意：虽然只邀请了他们吃午餐，但他们一直呆到晚饭时问才离开。
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