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将句子改为宾语从句
When does the train arrive?Please tell me．
Please tell me _______ _______ _______ _______．
将句子改为被动语态
We may need these machine parts in our work．
What does he do?Do you know?
Do you know _______ he _______?
They have greatly reduced the production costs．
将句子改为直接或间接引语
The teacher asked if all of us had handed in our papers.