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I. 单项选择
1. Swan Lake is a famous ballet in four acts, on a German fairy tale.
A. basing B. based C. bases D. to base
2. He had made a mistake, but when he realized it, he took measures against the possible loss it was too late.
A. until B. when C. before D. as
1. Swan Lake is a famous ballet in four acts, on a German fairy tale.
A. basing B. based C. bases D. to base
2. He had made a mistake, but when he realized it, he took measures against the possible loss it was too late.
A. until B. when C. before D. as
