According to the article, inventors used to secure patents on their inventions f

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问题 According to the article, inventors used to secure patents on their inventions far______than they can now.

选项 A、easiest
B、easier
C、most easily
D、more easily

答案 D

解析语法：比较级1．由空格后than可知，空格处应填人比较级结构。2．空格处应填入副词来修饰动词used to secure，因此副词比较级(D)为正确选项。

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Accordingtothearticle,inventorsusedtosecurepatentsontheirinventionsf