..求详解为什么选Tom _____ into the house when no one _____.A.sliped ,noticed B.had slipped ,noticed C.slipped,had noticed D.was slipping ,was noticing .

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..求详解为什么选Tom_____intothehousewhennoone_____.A.sliped,noticedB.hadslipped,noticedC.slipped,hadnoticed

..求详解为什么选Tom _____ into the house when no one _____.A.sliped ,noticed B.had slipped ,noticed C.slipped,had noticed D.was slipping ,was noticing .
..求详解为什么选
Tom _____ into the house when no one _____.
A.sliped ,noticed B.had slipped ,noticed C.slipped,had noticed D.was slipping ,was noticing .

..求详解为什么选Tom _____ into the house when no one _____.A.sliped ,noticed B.had slipped ,noticed C.slipped,had noticed D.was slipping ,was noticing .
A
两个都用过去时.首先slip不用进行时,先排除D;when no one noticed其实是一个表示过去时间的时间状语,所以主句中要用过去时,再排除B;从句中也不用过去完成时,最后排除C

B