I __________ a gift yesterday, but I didn't ________ it.

A．received, accept

B．received, accepted

C．accepted, receive

D．accepted, accept

维生素大多数是人体自身______制造，只能从______中摄取，维生素______构成细胞的主要成分，______为人体提供能量．人体每日对它们的需要量也______，但是它们对人体的重要作用是其他营养物质所______代替的．