The trend to A(empty a library) is being B(driven), academicians and librarians say, by the C(dwindling) need for undergraduate

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问题 The trend to A(empty a library) is being B(driven), academicians and librarians say, by the C(dwindling) need for undergraduate libraries, D(many of them) were built when leading research libraries were reserved for graduate students and faculty.

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答案D

解析 many of them改为many of which。which引导的定语从句,修饰先行词libraries。
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