Though Jack _______ many times, he still plays computer games after school.

A．was warned

B．has been warned

C．has been warning

D．had warned

一新生儿，娩出经过顺利，胎龄257天，出生体重1.6kg，其体重位于同胎龄平均体重的第3百分位，下列诊断哪个正确而且全面（）

A.足月儿，小于胎龄儿

B.早产儿

C.低出生体重儿

D.极低出生体重儿

E.早产儿，小于胎龄儿