It’s only six o’clock now; Little Tom should be up ,though, because he _____ for nine hours.
#102920
A
has been sleeping
B
had been sleeping
C
has slept
D
had slept
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Yangzhou high school ___________ since 1902. 
#100008
A
has come into existence
B
has been existed
C
has been in existence
D
began to exist
We      very early so we packed the night before.
#100576
A
leave
B
had left
C
were leaving
D
have left
Over the past l00 years,sea level      steadily as a result of global warming.
#103377
A
had increased
B
has been increasing
C
increased
D
is increasing