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信息发布者：

D

B

C

was playing
was waiting
was checking
was taking
were trying their best
 (更多请查看作业精灵详解)
When Bob arrived/reached/got home, his sister was doing the housework.
were discussing the Physics competition
torm
are
strongest
to break
pon
them
reaches
quickly
ut
alive
When I got there yesterday morning, many people were reading.
/When I arrived there yesterday morning, there were many people reading.
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