问题
选择题
201. Tom _____ into the house when no one .
A．slipped; was noticing
B．had slipped; noticed
C．slipped; had noticed
D．was slipping; noticed
答案
答案：A
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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
答案：A