I spent what might be a very long time persuading my child to stay.为什么用what而不用which或that?

I spent what might be a very long time persuading my child to stay.为什么用what而不用which或that? I still remember the time______ we spent together last year.A.when B.that C.what I asked her _ I might call and see her that afternoon.A.if B.what C.when D.that I will never forget the month_______we spent together in the country.A which B what C when What I spent almost two hours here for? —I don’t care what people think.—Well,you _________A.could B.would C.should D.might -I don't care what my teacher think.-Well,you _.A、could B、would C、should D、 might -what should i do when in london -ask police as you ___ in china A might B will ------I don,t care what my teathers think -----Well,you ---------.A could B would C should D might选哪项,为什么? -What's the name?-Khulaifi.___ i spell that for you?A.Shall B.Can C.Might D.WouldPlease explain. I was too busy those days,and I spent _____ little time I had with my family.A.how B.that C.which D.what i don't care what you might think about me. I'll never long for what might have been ___ ,I couldn't lift the box .A.As I might try B.Try as I might C.As try I might D.Try though I might I don't regret___even if it might have upset henA．to tell her what I thought B to have told her that I thoughtC．teIling what I thought D．telling her what I thought 英语15-What’s the name?15-What’s the name?-Khulaifi.________ I spell that for you?a.Shall b.Would c.Can d.Might为什么 i do not care what my teachers think1._I do not care what my teachers think. _Well ,you ( ). A .could B.would C.should D.might what happened to the bird i gave you.The bird ____well,but I didn't take care of it.A.would have grown B.might grow