One day, I received a call from a colleaguE. He was about to give a student a zero for his answer ...

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picked up; call at　　　　　　　　　 picked out; call on got; call on　　　　　　　　　　　　 received; drop in

picked up; call at picked out; call on got; call on received; drop in

I had known I knew did I know had knownI.

Then did I know Only then I knew Only then did I know Only then knew I

he received did he receive didn’t he receive had he received

Then did I know Only then I knew Only then did I know Only then knew I

did I knew I knew did I know knewI.

Then did I know Only then I knew Only then did I know Only then knew I

accepted ; receive accepted ; accept received ; receive received ; accept

picked up, call at picked out, call on got, call on received, drop in

hurt　 injured harmed　 wounded

he received did he receive didn’t he receive had he received

picked up; call at picked out; call on got; call on received; drop in

Then did I know Only then I knew Only then did I know Only then knew I

admitted received permitted allowed