Tom_______two of his classmates_______invited to the party.

A．as well as; was

B．as good as; were

C．and; have

D．as well; has been

姜片虫病引起发病的原因有（）

A.主要为机械性损伤

B.虫体代谢产物引起的毒性反应

C.大量感染可发生肠梗阻

D.虫体代谢产物引起的变态反应

E.大量虫卵沉积引起占位性病变