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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