单项选择题

He might have been killed ______ the timely arrival of the ambulance.

A. but for
B. except for
C. besides
D. except
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单项选择题
More and more advanced farm machines ______, the agricultural production increased tremendously.
A. using
B. having used
C. having been used
D. to have been used
单项选择题
Please come to the point, you are ______ the subject again.
A. straying from
B. getting off
C. dwelling in
D. giving up
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