因为这是一句话,选which说明逗号后面的句子是users的定语从句.如果用them,那就是两个句子,many前面必须有一个引导并列关系的连词and,原句中没有and,只能做为从句.所以选which.
英文选词填空This new NSF network attracted more and more instituti
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