It is said in the book that Tomas Edison __________ the worl

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It is said in the book that Tomas Edison __________ the world leading inventor for sixty years.
A.would be B.has been C had been D was
-George and Lucy got married last week .Did you go to their wedding?
-No,I ___________.Did they have a big wedding?
A.was not invited B.have not been invited
C.hadn't been invited D.didn't invite
C 我选的是C 请问这该怎么区分
for sixty years 要用完成时吗

过去完成时可以表示过去的过去,第一题是说明一个事实,过去的一个事,并没有突出要在哪一个时间点之前的过去,所以就用一般过去时.第二题说的是婚宴之前我没收到邀请,过去的过去.

It is said in the book that Tomas Edison __________ the worl It is said in the book that Thomas Edison(1874-1931)the worl It is said in the book that Thomas Edison ( )the world leadi It is said in the book that Thomas Edison (.) the world-lead It is said in the book that Thomas Edison ___the world leadi It is said in the book that Thomas Edison (1847-1931) ______ It is said in the book that Thomas Edison(1847-1931)______th 1）It is said in the book that Thomas Edison (1847-1931)_____ It is said in the book Tmomas Edison(1847-1931)____the world It is written in the book that Thomas Edison ____the world's It is said that the it is in the classroom that he lost his book.