The sunspot came into its active stage, __________ that happens once every elev

题干

The sunspot came into its active stage, __________ that happens once every eleven years.

A．one

B．it

C．the one

D．what

上一题下一题 0.64难度单项选择更新时间:2013-06-28 10:37:15

小学学科试题库

初中学科试题库

高中学科试题库