问题补充：
Professor Smith told me that the book was well worth .
A. reading
B. to be read
C. to read
D. being read
答案：
(答案→)A. reading
B. to be read
C. to read
D. being read
解析：考查固定结构。Sth be worth doing值得做某事，本结构没有被动语态，也没有进行时。
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