The blind man who ________ by a car ________ to hospital．

A.knocked over; was sent

B.was knocked at; was sent

C.knocked into; will be sent

D.was knocked down; must be sent

答案及解析： D

解析：

knock down撞倒。从句子的结构上看，应该用被动语态，第一空为过去时的被动语态，第二空为情态动词的被动语态。