When he ________ home, he saw his mother           the room.
#61148
A
got back; clean
B
got on; cleaning
C
got at; clean
D
got back; cleaning
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Great changes __ in the city in the past 20 years, and a lot of factories ____.
#59531
A
have been taken place; have been set up
B
have taken place; have set up
C
have taken place; have been set up
D
were taken place; were set up