题目内容
201. Tom _____ into the house when no one .
| A.slipped; was noticing | B.had slipped; noticed |
| C.slipped; had noticed | D.was slipping; noticed |
A
略
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题目内容
| A.slipped; was noticing | B.had slipped; noticed |
| C.slipped; had noticed | D.was slipping; noticed |