介詞填空。
l. That was an important date ________ which we set up our own business.
2. This was a difficult period ________ which we went through many sufferings.
3. He returned to the village ________ which he spent his happy childhood.
4. Do you know the reason ________ which he is absent?
5. Is this the car _______ which you paid a high price?
1. on  2. during  3. in 4. for  5. for
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