Li Hong's father kept telling her that she should work harder,but _____ didn't help

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• Li Hong's father kept telling her that she should work harder,but _____ didn't help
• 英语it或which的问题1.Tom's mother kept telling him that he shoud work harder,but ___ didn't help.A.he B.which C.she D.it2.The Parkers bought a new house but ___ will need a lot of work before they can move in.A.they B.it C.one D.which请问是不是都选it(which),那为什么不选which(it),请问什么时候又要选which(it)?
• they arrived ___London__a cold winter morning.A,at;in B,in;on C,at ;on D,in;atMust we turn off the TV now?no,you____now,but you ___when baby is sleeping.A,needn't...need B,mustn't...must C,mustn't...need D,needn't...musthis mother kept telling him that he should work harder,but___didn't help.A,she B,he C,which D,it he can't be at school,___?A,is he B,isn't he C,can he D,can't he
• Jack’s father kept telling him that he should work harder,but____didn’t work.A:he B:it C:she D:which
• Tom's mother kept telling him that he should work harder,but( )didn't helpA.it B.she C.which D.he如果but去掉的话,是不是应该选C?
• Li Hong's father kept telling her that she should work harder,but _____ didn't helpA.she B.he c.which D.it
• Bob's teacher kept telling him that he should work harder,but___didn't help.A.he B.which C.sheD.it
• Tom's mother kept telling him that he should work harder,but( )didn't help
• Bob's teacher kept telling him that he should work harder,but___didn't help.A.he B.which C.she
• Jack’s father kept telling him that he should work harder,but____didn’t work.
• 一个圆柱形状的水桶,他的底面内半径是30厘米,里面盛有一些水.把一个底面半径是10厘米的圆锥 的钢管浸没在水中,当零件从水中取出后,桶里的水面高度下降了5厘米.
• 以 K2Cr2O7 为基准物,用碘量法标定 Na2S2O3 溶液的浓度时,滴定速度过快,并过早读出滴定管读数,会产生正偏差还是负偏差 ?为什么?