jack __into the house when no one___A slipped ; was lookingB had slipped ; lookedC slipped ;had looked D was slipping ;looked为什么选A

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jack __into the house when no one___A slipped ; was lookingB had slipped ; lookedC slipped ;had looked D was slipping ;looked为什么选A

jack __into the house when no one___A slipped ; was lookingB had slipped ; lookedC slipped ;had looked D was slipping ;looked为什么选A
jack __into the house when no one___
A slipped ; was looking
B had slipped ; looked
C slipped ;had looked
D was slipping ;looked
为什么选A

jack __into the house when no one___A slipped ; was lookingB had slipped ; lookedC slipped ;had looked D was slipping ;looked为什么选A
looked表被动,句子意思是当时没有人看他!而且when表明是当时正在发生的事,所以直接排除BCD,选A!

A slipped, was looking

A
slip溜进去
看和溜同时进行
看时间长一些用进行
溜短一些用过去