U.S.President Barack Obama arrived in China’s economic center Shanghai on Sunday night, November 15th 2009, ___ a state visit to China.
#96500
A
starting
B
started
C
to start
D
having stated
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.________ that he had wasted a lot of time, Tom decided to work hard on his study.
#93855
A
Realizing
B
To realize
C
Realized
D
Having been realized
. The library’s study room is full of students _______ for the exam.
#95939
A
usily prepared  
B
usy preparing  
C
usily prepare  
D
re busily preparing
"We can’t go out in this weather," said Bob, ________ out of the window.
#95734
A
looking
B
to look
C
looked
D
having looked