首页
登录
职称英语
This is so difficult a problem that the scientist is known to ______ on it for a
This is so difficult a problem that the scientist is known to ______ on it for a
游客
2023-09-22
38
管理
问题
This is so difficult a problem that the scientist is known to ______ on it for about ten years, but hasn’t found an answer yet.
选项
A、have worked
B、have been working
C、be working
D、work on
答案
B
解析
这个科学家一直对如此难的问题研究了大约十年,但是仍然没有找到答案。不定式to have been working...作主语scientist的补足语,要用完成进行式表示。
转载请注明原文地址:https://tihaiku.com/zcyy/3037224.html
相关试题推荐
Itispossiblethatyourcompanyisfacingdifficultiesofwhichwearenotawar
Scientistscandeterminesomeone’sfavoritefoodfromtheirbodyshape.The
Scientistscandeterminesomeone’sfavoritefoodfromtheirbodyshape.The
Thecommitteefocusedontheproblemsofthehomeless,leavingotherbusinessunt
Accordingtothepassage,scientistshavediscoveredthatinfluenzaviruses____
Accordingtothepassage,scientistshavediscoveredthatinfluenzaviruses____
Accordingtothepassage,scientistshavediscoveredthatinfluenzaviruses____
Scientistshaveestablishedthatinfluenzavirusestakenfrommancancauset
Theheadmastertoldusthatascientist(give)______usalecturethenextafte
Therapidgrowthofcellphoneusersleadssomescientiststocalltheuseofce
随机试题
Whycan’tPeterrelaxoverthethree-weekvacation?[br][originaltext]Crystal
[originaltext]W:Terry,what’swrong?M:Igotlaidofffrommyjob.W
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputers
在下图的网络配置中,总共有()个广播域 A.2 B.3 C.4 D
根据《公开发行证券的公司信息披露编报规则第24号——科创板新试点红筹企业财务报告
目前常用的三种风险价值模型技术的方法不包括()。A.蒙特卡洛衡以法 B
干粉灭火器中的BC型干粉灭火器主要内充以碳酸氢销或同类基料的干粉灭火剂,适用于
发现有下列情况时,运维人员应立即汇报值班调控人员申请将电流互感器停运,停运前应远
下边四个图形中,只有一个是由上边的四个图形拼合(只能通过上、下、左、右平移)而成
思维的不可逆性和自我中心在皮亚杰所描述的( )阶段表现得最为明显。A、感知运算
最新回复
(
0
)