In order to finish the research, the professor always _______, for every day the light in hisroom didn’t go out until 4 a.m.
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A
mixed up
B
cleaned up
C
turned up
D
stayed up
推荐题目
Last year the factory ______ over six million records.
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A
put forward
B
put down
C
put out
D
put through
You’d better spend your time just on the things you find ______.
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A
worth doing them   
B
worth being done
C
worthy of doing them  
D
worthy of being done