The sunspot came into its active stage, that happens once every eleven years.A. oneB. itC

发布时间：2020-08-17 07:50:06

The sunspot came into its active stage,      that happens once every eleven years.
A. one
B. it
C. the one
D. what

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(答案→)A. one
B. it
C. the one
D. what
解析：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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