A 1 had been digging.2have been waiting.3have you been waiting here.4have been standing.5had been studying.6have been raining.7had been writing.8had been ringing.9had been painting.10had been running.11had been waiting
B 1had been cooking.2had prepared.3had been doing.4had done.5had done.6had been doing.7had sent
C. had been spending/had looked/wasn’t able/was/had been cooking/prepared/made/had baked/had been enjoying