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11.
A 2) took 3) sat 4) left 5) hadn't caught
B 1) was 2) had forgotten 3) got 4) was (мне кажется, что здесь по смыслу не очень подходит паст перфект, желая по конструкции должен быть конкретно он, т.е. had been, в общем не знаю правдиво разговаривая...)
C 1) had 2) got up 3) had finished 4) had
D 1) went 2) had 3) got 4) realised 5) had forgotten 6) went

12.
2) had had 3) had eaten 4) had been only driving 5) had left 6) had locked 7) had tried 8) had he called