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Error identification:
47. Wars is the most terrible. At the moment , wars are happening places in the world.
A
D
48.Since his bicycle has stolen last week, he has gone to school by bus.
А
D
49.She sometimes forgets to turn off the lights before she go to bed.
C D
А
В
50. When I came to see him last night, he listened to music.
C D
A B