A lot of attention ______ to greenhouse gas emission. Look at those environmental posters.
#101577
A
is paying
B
is being paid
C
has paid
D
had been paid
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By the time she_____体操比赛上 at the New York Good Will Games, she_________ a dedicated junior gymnast for eleven years. 
#103304
A
competed , have been
B
competes, had been
C
will compete, has been
D
competed , had been
In the school hall, where a meeting       , some students are busy preparing for it.
#102043
A
is held
B
has been held
C
is being held
D
is to be held
—Why? Where is the key to the meeting room? —Dear me! You ______ it in the taxi!
#104446
A
had never left
B
didn’t leave
C
never left
D
haven’t left