单项选择题

______ the program, they have to stay there for another two weeks.

A. Not completing
B. Not completed
C. Not having completed
D. Having not completed
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单项选择题
______ in thought, he didn't take notice of me when I was passing by.
A. Lose
B. Lost
C. Having lost
D. Have lost
单项选择题
Mr. Hall understands that ______ math has always been easy for him, it is not easy for the students.
A. unless
B. since
C. although
D. when
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