.Nancy isn’t here. It’s my fault, I forgot all about her.
A. to telephone
B. telephoning
C. to telephone to
D. telephoning by
网友回答
A. to telephone
(答案→)B. telephoning
C. to telephone to
D. telephoning by
解析：考查非谓语动词。句意：南希不在这儿。是我的错，我完全忘了打电话给他。About是介词，后面接名词或者名词性短语。动名词表示抽象动作，故选B