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 |
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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| A．ones | B．another |
| C．others | D．the others |
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| A．one | B．it | C．that | D．this |
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| A．how | B．which | C．this | D．it |
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| A．one | B．it | C．him | D．himself |
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| A．a; one | B．a ; the one | C．the; one | D．the ; the one |
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| A．something | B．anything | C．everything | D．nothing |
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| A．these | B．those | C．ones | D．others |