I don’t doubtwhat he said is true.A. thatB. ifC. whichD. such

问题补充：

I don’t doubtwhat he said is true.

A. that

B. if

C. which

D. such

答案：

(答案→)A. that

B. if

C. which

D. such

解析：本题考查连词。doubt当动词时,在肯定句中后面可接if或whether。 在否定句及疑问句中可跟that从句。