by the time 区别Thomas Edison __ already ___a chemistry lab for himself by the time he___tenA.has,built,was B.had,built,was C.would,build,was D.was,building,wasHe'll be a professor by the time he _____ forty five .A.is going to be

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by the time 区别Thomas Edison __ already ___a chemistry lab for himself by the time he___tenA.has,built,was B.had,built,was C.would,build,was D.was,building,wasHe'll be a professor by the time he _____ forty five .A.is going to be
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by the time 区别Thomas Edison __ already ___a chemistry lab for himself by the time he___tenA.has,built,was B.had,built,was C.would,build,was D.was,building,wasHe'll be a professor by the time he _____ forty five .A.is going to be
by the time 区别

Thomas Edison __ already ___a chemistry lab for himself by the time he___ten
A.has,built,was      B.had,built,was     C.would,build,was     D.was,building,was

He'll be a professor by the time he _____ forty five .
A.is going to be    B.was    C.will be      D.is
请问大神这两个里面的by the time  分别是什么意思 什么用法  然后用什么时态做.

by the time 区别Thomas Edison __ already ___a chemistry lab for himself by the time he___tenA.has,built,was B.had,built,was C.would,build,was D.was,building,wasHe'll be a professor by the time he _____ forty five .A.is going to be
第一题 选择B
第二题 选择D
by the time是时间状语的引导词,其后接的时间状语从句究竟用什么时态,要根据整个句子的情况来判断.
第一题是描述过去的事件,应当是主句用过去完成时,从句用一般过去时
第二题,主句是一般将来时,从句应当运用主将从现原则选用一般现在时.
供参考.

by the time 区别Thomas Edison __ already ___a chemistry lab for himself by the time he___tenA.has,built,was B.had,built,was C.would,build,was D.was,building,wasHe'll be a professor by the time he _____ forty five .A.is going to be in time ,on time ,by the time 的区别, when与by the time的区别 the first time,for the first time,by the first time用法区别 the first time,for the first time,by the first time怎么区别呢? by which time和by the time 区别两个都能引导从句,有什么不同 for the first time,first time,the first time和by the first time的具体用法和怎样区别? by the time ,by then By the time by the time 对括号内部分提问：The kight bulb was invented by Thomas Edison.The light bulb was invented by Thomas Edison. by which time ,in which time 区别 Thomas Edison ____ already ____ a chemistry lab for himself by the time he ____ ten.A.has…built…was B.had…built…was C.would…build…was D.was…building…is the light bulb was invented by （Thomas Edison）对括号部分提问 time pass by 与 time go by 有什么区别? as time goes by和time goes by的区别 time gose by 与time went by区别 3.The light culb was invented by Thomas edison.对最后两个词提问--the light bulb-by?