all about that

.He has just arrived, but he talks as if he _____ all about that. A．know 　　　　　 B．knows C．known　　　　　 D．knew

why don't you explain what this is all about?all about修饰 what?

213.Nancy isn't here.It's my fault,I forgot all about ___ her.
(A) telephoning (B) to telephone (C) to telephone to (D) the telephoning to
214.We hope ___ the examination.
(A) past (B) pass (C) to pass (D) passed
215."Are you going to leave now?" "Unless you would prefer me___ here.'
(A) to stay (B) will stay (C) that I stay (D) stay
216.I'm going to the passport office_____.
(A) to stamped my passport (B) for stamping my passport
(C) to have stamped my passport (D) to have my passport stamped
217.Before he came to London,he had never heard a single English word ___.
(A) speaking (B) spoken (C) to speak (D) speak
218.____a hot day.I decided to go for a swim.
(A) What (B) Being (C) Having been (D) It being
219.The child tired___ ,closed his eyes and slept.
(A) of playing long hours (B) that he had played long hours
(C) playing long hours (D) to play long hours
220.She came into the office___ the door.
(A) without knocking to (B) without to knock
(C) without to knock at (D) without knocking at
221.Her son promised___ in the bedroom until the baby stopped ___ .
(A) staying...to cry (B) for staying ...to cry
(C) to stay...crying (D) to stay ...to cry
222.Mary is a turner.She spent three years in a factory ___ for the job.
(A) to train (B) training (C) being trained (D) train
223.____,the invention is useless.
(A) To speak practical (B) Speaking practical
(C) Practically speaking (D) In speaking practical
224.I advise you ___ of ___ out such a dangerous plan.
(A) to stop to think ...carry (B) to stop thinking...carrying
(C) stop thinking ...carry (D) to stop thinking...to carry
225.Because of my poor English I'm afraid I can’t make myself_____.
(A) understand (B) to understand (C) understanding (D) understood

.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

Nancy isn't here.It's my fault,I forgot all about ___ her
A.telephoning
B.to telephone