Many kinds of help by plane or by train to the area ever since the earthquake hit it.A.

问题补充：

Many kinds of help by plane or by train to the area ever since the earthquake hit it.

A. had been offered

B. have been offered

C. are offered

D. were offered

答案：

A. had been offered

(答案→)B. have been offered

C. are offered

D. were offered

解析：时态、语态题。根据句中的时间状语since the earthquake hit it.可知要用现在完成时，help与offer为动宾关系所以用被动语态。句意：自从地震后许多援助通过飞机或火车运到灾区。