worth ¹

《新英汉词典》认为 worth 是形容词，“用作表语，后接宾语”。2000 年版已改为介词。国外的许多语言学家(如 Curme 等)也把 worth 看作是形容词。但 R. Quirk 等则认为 worth 具有介词的语法特征：支配名词短语、支配带逻辑主语的动名词以及 what 从句：

1. San Francisco is worth $\$left\{\begin{array}{l} frequent visits. \\ your visiting frequently.\end{array}\right. 旧金山值得经常参观。

2. The bicycle is not worth what you paid for it. 这辆自行车不值你付出的那么多钱。请做下面的英语试题：

3. Only one of these books is ____.

A. worth to read B. worth being read C. worth of reading D. worth reading(全国高考)

2. —What do you think of the book?

—Oh, excellent. It's worth ____ a second time.

A. to read B. to be read C. reading D. being read(全国高考)