These proposals sought to place greater restrictions on the use and copying of digital information than ______ in traditional me

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问题 These proposals sought to place greater restrictions on the use and copying of digital information than ______ in traditional media.

选项 A、exist
B、exists
C、existing
D、to exist

答案A

解析 本题考查对于句子结构的掌握。本句中的than是关系代词,引导定语从句,其先行词为restrictions。than引导的这类从句有一个先决条件:先行词前必须有形容词比较级。
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