一道关于数词的题he began to work there_________A、on his fiftyB、at age of fiftyC、when he fiftyD、in his fifties我觉得 D B都对啊

一道关于数词的题he began to work there_________A、on his fiftyB、at age of fiftyC、when he fiftyD、in his fifties我觉得 D B都对啊 但是有一道题是这样的.How long do u suppose it is ____ he arrived and began to work here A afterB since为什么不选A呢? 关于until和when的选择题是一道完形填空,里面有一段是When all the seats were taken,the driver started the engine.The conductor began to collect fares.When she came to an old man in worn-out clothes,he explained that he had spent all began to 如题 He began to learn English when he was four years old(同义句) He began to learn English _________要真确的，不给不要回 关于英语现在完成时方面的.Having turned off the TV set,he began to go over his lessons.=After turning off the TV set,he began to go over his lessons.第一句话为什么用having done?动作是在began之前不是应该用过去完成时 关于when,as,while的一道英语题目The students are playing basketball__ it began to rain.A.as B.while C.when 请给出解释. 英语一道保持原句意思George began to learn computer when he was ten.George ______ begin to learn computer _______ he was ten. 关于英语he began learning snooker at the age of eight 的同义句he began learning snooker___ ___ ___eight years old 一道关于数词的英语题目It's not rare in ______ that people in ____ fifties are going to university for further education .A.90s;theB.the 90s;/C.90s;theirD.the 90s;their这个题我不太会啊,什么90s是什么东东啊.小弟不甚感激! After he ____(get)home,he began to cook meals He began to think about just what he would do, he began to work in this shop several years ago的近意 指出：He was seated himself at a desk and began to write的一处错误 初中英语数词部分In _____,Mr.Li began to learn English.A.his 1990 B.the 1990’s C the1990 D a 1990那个B选项是有一撇S的 my uncle began to learn horse horse riding at the age of four的同义句 my uncle began to learn riding --- he ---- At last he b________a singer and began to sing song.如题. He began to laern dancing when he as 10.变同义词He began to laern dancing ----- ----- ----- -----10.