Nancy isn't here.It's my mistake.I forgot all about____ her.

问题描述:

Nancy isn't here.It's my mistake.I forgot all about____ her.
A.telephoning B.to telephone C.to telephone to D.the telephone to

选A.
forget all about +doing sth.or sth.
忘了做某事.
在这里指完全忘了要给她打电话的这件事.