Underline the correct item.
1) By the time Graham arrived at the train station, the train has already been leaving/had already left.
2) How long had you been trying/had you tried to call Tom before he finally answered the phone.
3) The children had been putting away/had put away their toys before their mum came back home.
4) Alan had a headache because he had played/had been playing computer games all afternoon.
5) Simon had saved/had been saving money for many years before he bought his own house.
6) The football game had just been starting/had just started when it began to rain.