睾丸积液是怎么形成的:句型转换

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It's time for class.（同义句）
It's time _______ _______ class.

to have
to begin

to have

It's time for class.（同义句）
It's time to have class.

to have

it's time for class = it's time to have class.
该上课了

It's time to have class.

句型转换 句型转换. 句型转换 句型转换 句型转换 句型转换 句型转换！！！ 句型转换 句型转换: 句型转换