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：
解析：
|
考查代词．one可替代同类可数名词，此处作stage的同位语．此处为泛指，故不加the． |
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