精英家教网 > 高中英语 > 题目详情
No one knows exactly ______ this important discovery was made.
A.that   B.that how   C.what   D.when
D
考查名词性从句。when什么时候,句意:没有人确切的知道什么时候发现这个重要的发现。
练习册系列答案
相关习题

科目:高中英语 来源:不详 题型:单选题

________ the Internet is bridging the distance between people, it may also be breaking some homes or will cause other family problems.
A.WhenB.WhileC.IfD.As

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

There is no doubt ______ they all passed the examination.
A.ifB.whichC.thatD.whether

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

I recorded the professor’s speech on my cellphone _____ I could listen to it several times later.
A.in caseB.now thatC.even thoughD.so that

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

It was not just the size of the party last night _______ made it unique, but ________ it meant to our school.
A.what; thatB.that; whatC.what; whatD.that; that

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

Contemporary English is quite different from Old English. There has never been a year____    the language was not changing.
A.thatB.whenC.forD.until

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

We can’t take part in the competition ________ we get our student card.
A.beforeB.ifC.WhileD.as

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

He still lives in the room _____ there is a beautiful table.
A. which
B. whose
C. where
D. of which

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题

Betty shows great interest in this poem now, but she thought it boring     she read it.
A.at the first timeB.the first time
C.for the first timeD.at first

查看答案和解析>>

同步练习册答案