The geography teacher told his student that the earth ________around the sun .
#101826
A
traveled
B
travels
C
would travel
D
travelling
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After school we went to the reading-room to do some reading ,only to be told that it _______.
#99938
A
was decorated
B
had decorated
C
had been decorating
D
was being decorated
I am so tired,for I ________ English for 2 hours.
#99761
A
is studying 
B
have been studying
C
was studying 
D
had been studying