I don't know what ___was for supper that day.

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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.

I don't know what ___was for supper that day. I don't know what I can do for you 为什么用what不用that I don't know what to wear for the party I don't know what I I don't know what mean for this question!I don't know what m Don't say that I don't know anything; in fact ,I know what y I don't know what to say sorry that I don't know what _____（eat） for lunch I don't know what to do for homework I don't know what this is for me? I don't know what I think I just know that I don't know if you know what I known.I believed that you ca i don't know what you know