The gap between rural and urban education in China is widening, and education is the key to _____ rural problems.
#95738
A
solving
B
solve
C
have solved
D
having solved
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The observations which he reported __________ marketing bothered his boss a lot. 
#95478
A
being concerned
B
concerned
C
be concerned
D
concerning
       all day, I went to bed early.
#95010
A
Working hard
B
Worked hard
C
Having worked hard
D
To work hard