He is the only one of the students who _____ a winner of scholarship for three years. 
#102115
A
is
B
are
C
have been
D
has been
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---The window is dirty.----I know. It ______ for weeks.
#101155
A
hasn’t cleaned
B
didn’t clean
C
wasn’t cleaned
D
hasn’t been cleaned
Luckily good things _________ here to save local wildlife.
#102513
A
are doing
B
are being done
C
had been done
D
will do
As the supermark_______, allthe goods are sold at half price.
#104887
A
has closed down
B
is closing down
C
closed down
D
had closed down