(2013·山东济南二模)The poem A Red, Red Rose written by Robert Burns is popular with the Chinese young people, because the poem is easy ________.
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A
to be understood
B
to understand
C
understand
D
understanding
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More than 200 dead pigs       in the waterways have raised urgent concern.
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A
found
B
being found
C
to be found
D
having found
________the working efficiency,the boss allows the employees to have a coffee break.
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A
Improving
B
To improve
C
Having improved
D
Improved
The missing boy was last seen_____ near the East Lake.
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A
playing
B
play
C
played
D
to play