The pills       him.If only he had taken them regularly.

A．could help

B．may help

C．must have helped

D．might have helped

有关日本疆域的说法，错误的是（　　）

A．与其他国家有漫长的陆上国界

B．ri本位置对造船业、海上运输十分有利

C．海岸线曲折，多优良港湾

D．ri本位于亚洲东部