________ on facts, the report should be reliable(可靠的)．

________ on facts, the report should be reliable(可靠的)．

A.Based

B.Basing

C.To be based

D.To base

答案及解析： A

base与句子主语之间有被动含义，故应用其表被动的过去分词形式，C项虽也表被动，但不定式置于句首时常作目的状语。