英语19.Tom ________ into the house when no one _______.19.Tom ________ into the house when no one _______.a.slipped;was looking b.had slipped;looked c.slipped;had looked d.was slipping;looked为什么

问题描述:

英语19.Tom ________ into the house when no one _______.
19.Tom ________ into the house when no one _______.
a.slipped;was looking b.had slipped;looked c.slipped;had looked d.was slipping;looked
为什么

d

B
动作一前一后,在没有看到的时候,遛了进来

C

B
表示状态

b:tom 在没人注意的情况下已经溜进房中.slipped 这个动作发生在looked 之前