As far as I could tell, he had never done one happy, noisy kid thing.
A.As far as I knew,he had never behaved like a naughty kid. B.As far as I knew,he had never made friends with other kids. C.As far as I knew,he had never played happily with other kids. D.As far as I knew, he had never been so naive and childish like other kids.正确答案A
