一道英语选择题，请详细解释
Greatchangeshavetakenplaceinthatschool.Itisnolongerwhatitwas20yearsago,______poorlyeq...
Great changes have taken place in that school.It is no longer what it was 20years ago,______poorly equiped.
A.when B.which
答案选A，为什么B不对？which引导非限制定语从句 展开
A.when B.which
答案选A，为什么B不对？which引导非限制定语从句 展开
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