Bats are surprisingly long-lived creatures, some _______ a life span of around 20 years.
#88688
A
had
B
having
C
have
D
to have
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We will have modern equipment ______ things that are complicated. This will make things simple.
#96765
A
to assist us with
B
assist us to
C
to assist us in
D
assisting us with .
The research is so designed that once _______ nothing can be done to change it.
#98631
A
begins
B
having begun
C
beginning
D
begun
--- The light in the office is still on. --- Oh, I forgot _______.
#98793
A
turning it off
B
turn it off
C
to turn it off
D
having turned it off
_________ around the Water Cube，we were then taken to see the Bird’s Nest for the 2008 Olympic Games．
#97902
A
Having shown
B
To be shown
C
Having been shown
D
To show