The sunspot came into its active stage, ____ that happens once every eleven year
题型：不详难度：来源：
| The sunspot came into its active stage, ____ that happens once every eleven years. |
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。 |
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