单项选择题

I was _________ study French yesterday, but I changed my mind.

A．to be starting
B．to start
C．to have started
D．to have been starting
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单项选择题
One of the most spectacular qualities of man is notably his _________ to any kind of natural environment.
A．tendency
B．adoptability
C．adaptability
D．availability
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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