摘要： -----As everyone knows, the way of farming has changed a lot. ----Of course. And some other changes on farms in the last 100 years. A. happened B. have happened C. happen D. are happening 分析:happen意为发生 ,往往带有偶然或未能预见的意思, 与take place 同义.由in the 100 years可知用现在完成时.答案为B.

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?As everyone knows, the way of farming has changed a lot.

?Of course. And some other changes ________ on the farms in the last 100 years.

A. takes place

B. have taken place

C. took place

D. have been taken place

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--As everyone knows, the way farming has changed a lot.
--Of course. And some other changes ________ on the farms in the last 50 years.

A.
takes place
B.
have taken place
C.
took place
D.
have been taken place

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--As everyone knows, the way farming has changed a lot.--Of course. And some other changes ________ on the farms in the last 50 years.

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--As everyone knows, the way farming has changed a lot.
--Of course. And some other changes ________ on the farms in the last 50 years.