老师不在的时候,我们也能保持安静.We can keep quiet when the teacher ______ ______ .

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老师不在的时候,我们也能保持安静.We can keep quiet when the teacher ______ ______ .

老师不在的时候,我们也能保持安静.We can keep quiet when the teacher ______ ______ .
老师不在的时候,我们也能保持安静.We can keep quiet when the teacher ______ ______ .

老师不在的时候,我们也能保持安静.We can keep quiet when the teacher ______ ______ .
We can keep quiet when the teacher is absent.
或者
We can keep quiet when the teacher is out.