应该选B.你可以把这句话现变成陈述句的句型再答题,就会发现很简单.该句的句型为
be worth doing. 因此上面的句子应为：what he said is worth believing .
(他所说的话值得相信.)其疑问句形式为 Iswhat he said worth believing? (said后面应该没有it.)