早教吧作业答案频道 -->英语-->
they have been collecting stamps for 10 years在 collecting stamps下画线了 对画线部分进行提问( ) have they ( )( )for 10 years?
题目详情
they have been collecting stamps for 10 years
在 collecting stamps下画线了 对画线部分进行提问
( ) have they ( )( )for 10 years?
在 collecting stamps下画线了 对画线部分进行提问
( ) have they ( )( )for 10 years?
▼优质解答
答案和解析
What have they been doing for 10 years?
看了 they have been...的网友还看了以下：
半径为R，均匀带正电荷的球体在空间产生球对称的电场；场强大小沿半径分布如图所示，图中E0已知，E- 2020-05-13 …
设A为n阶矩阵,证明：R(A+I)+R(A-I)>=n已知R(A)＝R(kA),k≠0；R(A+B 2020-05-14 …
Tom and Fred are students.They are both twelve ye 2020-05-16 …
They keeps talking about the party,they had a ver 2020-05-16 …
初三英语（选词填空）选词填空I have a __1__ famliy.MY father and 2020-05-17 …
连词成句：1：have they lot a there fun of （.）最好解释下中文【可以 2020-05-17 …
我们约定正数a和b,如果a除以b的商的整数部分记作Z(a÷b),则它的余数记作R(a.我们约定正数 2020-06-17 …
什么是二项式的通式?在二项式定理(a+b)^n=C(n,0)a^n+C(n,1)a^(n-1)b+ 2020-07-31 …
非齐次线性方程组解的问题设AX=b为n元线性方程组,其导出组为AX=0,r(A)=r,η是AX=b 2020-08-02 …
已知R={A,B,C,D},F={AB→C,C→A,C→D},确定R的候选码和主码。下面是老师给出的 2020-11-02 …