Robert Kubica says he understands why question marks remain over his ability and admits he would also have doubts about his return to Formula 1 if he was a team boss.  The 35-year-old Pole will complete a remarkable comeback to F1 with Williams in 2019, eight years after suffering severe injuries to his right arm that cut-short his promising career in the sport. Kubica, who tested for Renault and Williams throughout 2017 and 2018, said he has come to accept why people had struggled to believe a return to grand prix racing was realistic, having been absent from the F1 grid since taking part in the 2010 Abu Dhabi Grand Prix.  5774263478001 CrashTV:  "If I would be a team...
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