It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.
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A
locking
B
locked
C
to lock
D
lock
推荐题目
.________ that he had wasted a lot of time, Tom decided to work hard on his study.
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A
Realizing
B
To realize
C
Realized
D
Having been realized
. The library’s study room is full of students _______ for the exam.
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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.
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A
looking
B
to look
C
looked
D
having looked