Beijing ________ a lot over the years. Now it has become one of the biggest ______ in the world.
#38242
A
changes; cities
B
changed; city
C
has changed; cities
D
changed; cities
推荐题目
—Where’s Li Hua?—Look! He ____ tennis on the playground.
#40036
A
plays
B
played
C
playing
D
is playing
You are too late. The film ______ since half an hour ago.
#41970
A
has begun
B
has been on
C
began
D
begins
– Look at these factories. I hate them. They____ many rivers here. --Yes. Something ______ to stop the pollution.
#39701
A
polluted, must do
B
had polluted , must be doing
C
have polluted , must be done
D
were polluting, must be done