一个星期有7天，三月份有31天，合几个星期还多几天？
31÷7=4（个星期）…3（天）；
答：三月份合4个星期，还多3天．
Grandma was ill. That was why she __ upstairs last night. [ ]
A. was helped
B. was helping
C. helped
我国土地增值税采用四级超额累进税率。其中，最低和最高税率分别为( )。
A．30%，60% B．25%，60%C．20%，50% D．10%，30%
