用must 和 have to填空

用have to 和must 填空. 用must或have to填空 用would,should,must ,have to 填空 用have to或must填空. 用must,have/hai to,have/has got to填空 用must,have/has to,will have to填空 用can,must,musn't,have to,has to填空 用must,have to填空：We____ be strict with ourselves. 用 can may must have to及否定形式填空 用can,can't,must或have to 填空 用have to的适当形式或must填空 用had to 或 must have been填空.