When and where this took place _____ still unknown.
A．isB．hasC．wereD．a(chǎn)re
A

試題分析：考查主謂一致：句意：這在什么時候什么地方發(fā)生的還不知道。主語是單個的主語從句的時候謂語用單數(shù)，unknown是形容詞，前面用be動詞，選A。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：完形填空

An average of about 100 emails a week ________(be) received. Such ________(be) the case with Martin at present.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Nowadays, either 21st Century or other English newspapers _____ increasingly popular among us students.
A．a(chǎn)reB．isC．wereD．was

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Every possible means ______ to prevent the air pollution, but the sky is still not clear. 
A．has been used　B．have been usedC．is used　D．a(chǎn)re used

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Either you or one of your students __________ to attend the meeting that is due tomorrow.
A．a(chǎn)reB．is C．haveD．be

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

According to my father, movies, such as the one you talked about yesterday, _____ not worth seeing.
A．a(chǎn)reB．doC．isD．does

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

______ the houses were knocked down in the earthquake.
A．A great many B．The number ofC．A great many ofD．A great deal of

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.
A．isB．a(chǎn)reC．hasD．have

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

The teacher, along with 5 of her students, ________talking with a foreign teacher in the English Corner at that time.
A．wasB．wereC．had beenD．would be

查看答案和解析>>

同步練習(xí)冊答案