_____ the classroom, I found his pen lying on the ground.

[     ]

A. When cleaned
B. If cleaned
C. When cleaning
D. If cleaning
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科目：高中英語 來源：寧夏自治區(qū)期末題 題型：改錯題

短文改錯。
     英語課上，老師要求同桌同學(xué)相互修改作文。假設(shè)以下書信為你同桌所寫，請你對
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     I like music very much, especially pop songs. Every evening then I am doing homework and at
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短文改錯。
If there are more people in the world, and there
must have more food to feed these people. But food 
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enough food. Ten thousand people dying of hunger
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2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____

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To show our respect，we usually have to take our gloves off ________ we are to shake hands with.
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A. whichever  
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Will you help me to look for an important file I left in my office this morning immediately you _____?

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When you finish, please put the book back _____ it was.

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_____, the players began the game.

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_____ difficulties we may come across, we'll help one another to overcome them.
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A. Wherever
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This is a very interesting book. I'll buy it, _____.
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