语法巩固
1.句型转换
1. it is impossible that a child can lift such a heavy box.
it is impossible _______________________such a heavy box.
2. it happened that you had known each other before.
you happened ____________________each other before.
3. the progress which will be made soon is of great importance.
the progress _________________________ is of great importance.
4. the boss made the workers work all night.
the workers were ______________all night.
5. when we should hold the meeting is still to be discussed.
when _________________ the meeting is still to be discussed.
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