People all around the world have been doing as much as they can ________the people in Afghanistan.

A．help　　

B．to help

C．helping　　

D．helped

关于内脏蠕虫蚴移行症的临床特点，错误的是

A.因治疗相同所以均首选阿苯达唑

B.圆管线虫病以嗜酸性脑膜脑炎为主

C.异尖线虫幼虫引起的病变以消化道为主

D.犬弓蛔虫病，以肝脏病变最为显著

E.猪蛔虫病主要表现呼吸道症状