誰解決了這個難題？

Who solved the hard problem?

Source: Tatoeba

Sentence Composition

1 誰 shéi
  1. who
  2. also pr. shuí
2 解決 jiějué
  1. to solve; to resolve; to settle (a problem)
  2. to eliminate; to wipe out (an enemy, bandits etc)
=3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=3 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 無 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 瞭 liǎo)
=3 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=3 了 liào unofficial variant of 瞭 liào
4 這個 zhège
  1. (pronoun) this
  2. (adjective) this
5 難題 nántí difficult problem