Tom （）into the house when no one （）. ( 章节：2 难度：1)
- A、slipped; was looking him
- B、had slipped; looked him
- C、slipped; had looked him
- D、was slipping; looked him
正确答案:A
答案解析:有
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Tom （）into the house when no one （）. ( 章节：2 难度：1)
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