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