I don't know what ___was for supper that day.A.it B.there C.that D.food为什么答案选B?We regard ____to learn English grammer.A.it necessary B.it as necessary为什么答案选B?

I don't know what ___was for supper that day.A.it B.there C.that D.food为什么答案选B?We regard ____to learn English grammer.A.it necessary B.it as necessary为什么答案选B?
I don't know what ___was for supper that day.
A.it  B.there  C.that  D.food
为什么答案选B?
We regard ____to learn English grammer.
A.it necessary   B.it as necessary
为什么答案选B?

I don't know what ___was for supper that day.A.it B.there C.that D.food为什么答案选B?We regard ____to learn English grammer.A.it necessary B.it as necessary为什么答案选B?
第一题,know后面部分为宾语从句,what提问的是supper的食物,原句there was **（某种食物）for supper that day.对这种食物用what进行提问,即what was there for supper that day?
放在宾语中,即I don't know what there was for supper that day.
第二题,regard sth.as.(+adj.)是固定搭配哦.