早教吧作业答案频道 -->英语-->
TheRussianrocketdesignerhasdied.Formanyyears,he______asanimportantassistanttothefatherofSovietspaceprogram.A.servesB.wasservingC.servedD.hasserved为什么选C
题目详情
The Russian rocket designer has died. For many years, he ______ as an important assistant to
the father of Soviet space program.
A. serves
B. was serving
C. served
D. has served
为什么选C
the father of Soviet space program.
A. serves
B. was serving
C. served
D. has served
为什么选C
▼优质解答
答案和解析
C
死前,他一直以一种助手身份服务,工作.过去时
死前,他一直以一种助手身份服务,工作.过去时
看了 TheRussianrock...的网友还看了以下:
A.πA,D(σC=D(R×S))B.πA,R,D(σS,C=R,D/(R×S))C.πA,R,D( 2020-05-26 …
A.πA,D(σC=D(R×S))B.πA,R.D(σR.C=S.D(R×S))C.πA,R.D(σ 2020-05-26 …
A.πA,D(σC=D(R×S))B.πA,R.D(σS.C=R.D(R×S))C.πA,R.D(σ 2020-05-26 …
程序,数学小知识点解答证明:a可以表示成a=kb+r,则r=amodb假设d是a,b的一个公约数, 2020-06-11 …
数据库中σ这个符号是什么意思啊设有关系R(A,B,C)和关系S(B,C,D),那么与R⋈S等价的关 2020-07-10 …
设一组初始记录关键字序列为(Q,H,C,Y,P,A,M,S,R,D,F,X),则按字母升序的第一趟 2020-07-17 …
C关于自加结果#includevoidmain(){intj=5,k=5,h=5,q,r,s;q= 2020-07-23 …
求过点E(5,0)且与圆(X+5)2+Y2=36相外切的圆的圆心轨迹方程.设该圆心为D,半径为r, 2020-07-26 …
若矩阵有一个r阶子式不为零,则下列结论正确的是[(D)](A)R(A)r;(D)R(A)≥r为什么选 2020-12-23 …
这几个字母怎么拼才是单词呢?B-E-E-N-M-O-R-VA-E-R-T-WA-B-C-D-O-P- 2021-02-09 …