it is said that that was the beginning of raising silkworms1:it is said that 2:RAISE为什么加ING

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it is said that that was the beginning of raising silkworms1:it is said that 2:RAISE为什么加ING

it is said that that was the beginning of raising silkworms1:it is said that 2:RAISE为什么加ING
it is said that that was the beginning of raising silkworms
1:it is said that
2:RAISE为什么加ING

it is said that that was the beginning of raising silkworms1:it is said that 2:RAISE为什么加ING
it is said that 据说
介词OF后面动词加ING

1 据说
OF是介词,后面要跟名词
所以RAISE加ING 变成动名词

1:it is said that 据说
2:of 后面的动词要改成相应的动名词,动词+ing.

1.据说
2.of后面加动词的ing形式

1.据说
2。of 后用的是名词性短语