The picture ______ on the wall is painted by my grandfather.
#93981
A
having
B
hanging
C
hangs
D
being hung
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When he ______the door, he found his keys were nowhere.
#88230
A
would open
B
opened
C
had opened
D
was to open
 ______ better in 2010 World Expo is the duty of every citizen in Shanghai. 
#96717
A
Being served
B
Serving
C
Serve
D
Having served
 I _______ that the job has been filled.
#96610
A
regret to say
B
regret saying
C
regret to have said
D
regret said
Martin Cooper , a US researcher , was considered _______ the first cell phone .
#96873
A
invented
B
to invent
C
having invented
D
to have invented