________ is often the case, we have worked out the production plan.
A．WhichB．WhenC．WhatD．As
D
本題考從句。句中逗號后已構(gòu)成句子，逗號前則不能是獨立句子，只能是一個從句，句子不缺主、賓、表等成分，不需要名詞性從句，排除what，從句中缺主語，when只是連詞（或副詞），不能充當主語，故排除。which和as都能引導定語從句，先行詞都可以是一句話（或一個短語或從句），但which引導的定語從句不能放在句子開頭，故選D，排除A。
練習冊系列答案
相關(guān)習題

科目：高中英語 來源：不詳 題型：單選題

There is a common belief among them _______rubbish can and should be put to good use .
A．whichB．if C．whose D．that

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

The workers were making so much noise in the workshop, and the boss hurriedly went to see ____.
A．what the matter wasB．what was the wrong
C．what wrong wasD．what was the matter

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

I think you ought to end it ____ it is too late, or you’ll kill yourself.
A．even ifB．beforeC．so thatD．once

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

My cousin keeps the photo ____ he can see it every day, as it always reminds him of his college days in Florida.
A．whichB．whereC．whetherD．when

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Every day the mother seems to be busy until 10 o’clock at night, ____the rest of the family have fallen asleep.
A．thatB．by which timeC．on timeD．whose time

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

He expressed his hope ____ he would visit China again the next year, and this was the very hope ____ he expressed as soon as he arrived in the country.
A．that; thatB．which; whichC．that; whichD．which; that

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

You can’t guess ______ when he was admitted by Beijing University.
A．how he was happyB．how happy was he
C．how happy he wasD．he was how happy

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

October 15 th is my birthday, ________ I will never forget.
A．whenB．thatC．whatD．which

查看答案和解析>>

同步練習冊答案