题目内容
The sunspot came into its active stage, ____ that happens once every eleven years.
A. one B. it C. the one D. what
【答案】
A
【解析】
试题分析：考查代词。句中one作同位语，代指前面的sunspot’s active stage。句意：太阳黑子进入了活跃期，活跃期每11年发生一次。故A正确。
考点：考查代词
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