＿＿＿＿＿ you have given me a lot of help. A. Tell the truthB. To tell the truth C. Telling t

问题补充：

＿＿＿＿＿, you have given me a lot of help.

A. Tell the truth

B. To tell the truth

C. Telling true

D. Telling truth

答案：

A. Tell the truth

(答案→)B. To tell the truth

C. Telling true

D. Telling truth

解析：常见的作插入语的不定式短语有：so to speak(可以说是),to be sure(无疑地),to sum up(概括地说),to tell the truth(说实话),to be honest(坦率地说),to be frank(坦率地说)，to be fair(说句公道话)。