单选题
They gave each competitor a number; but they ______ number 13 as no one wanted to have it.
A、
left out
B、
left off
C、
left behind
D、
retained
【正确答案】
A
【答案解析】
leave out省去，不考虑。leave off停止做或使用。leave behind留下；超过。retain保持，保留。
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