属于免疫活性细胞的是

A．红细胞
B．血小板
C．神经细胞
D．吞噬细胞
E．精细胞

— Honey, this is a present for your birthday.

— Ah! A pair of shoes, a well-known brand — Nike! I think it must ______ comfortably.

A．be worn

B．be wearing

C．have worn

D．wear