A scientific report has found that snow and ice on Africa’s highest mountain Kilimanjaro ______rapidly and could vanish within 20 years.   
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A
has been melted
B
will melt
C
is melting
D
was being melted
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________ repeatedly, the problem still appeared in the beginners’ homework.
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A
Explaining
B
Having explained
C
Having been explained
D
To be explained
At the moment of the car accident, Jason’s life _____ in the blink of an eye.
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A
changes
B
had changed
C
was changing
D
changed