问题补充：
It is to read the books our teacher recommended , for they are well reading.
A. worthy ; worthwhile
B. worth ; worthwhile
C. worthwhile ; worthy
D. worthwhile ; worth
答案：
A. worthy ; worthwhile
B. worth ; worthwhile
C. worthwhile ; worthy
(答案→)D. worthwhile ; worth
解析：此题重点考查三个短语的区别。worth只作表语，表示“价值…”或“值得…”，多接名词、代词、或动名词的主动语态;worthy表示“值得、相称或配得上”时，作表语，接不定式被动语态，或of加名词、动名词被动语态；It is worth (one’s) while to do sth [doing sth] 结构必须用it作形式主语，其中的不定式或动名词做句子的真正主语。
