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
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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
单项选择题
In the coal mine disaster, most of the workers were killed but John ______ have a narrow escape.
A. could
B. would
C. was able to
D. can
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