English is a language that many young people around the world         not speak perfectly but         at least understand.

A．may; can

B．would; might

C．will; must

D．could; might

患者女，13岁，前牙后侧牙间 * * 呈球状突起，松软光亮，局部刺激物不明显，探诊未及附着丧失

最可能的诊断为

A．青少年牙周炎

B．妊娠期龈炎

C．药物性牙龈增生

D．青春期龈炎

E．牙间 * * 炎