Воткните правильную форму глагола , объясните собственный выбор1) He ... troubled

Воткните правильную форму глагола , объясните собственный выбор
1) He ... troubled yesterday
a) looked b) is looking c) had looked
2) She ... never ... this work
a) have ... done b) has ... done c) has ... do
3) A boy ... a book now
a) reads b) is reading c) reading