单项选择题

If people don’t learn from this, then his suffering and death were __________.

A．in vain
B．on vain
C．for vain
D．to vain
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单项选择题
The law requires equal treatment for all, __________ of race, religion, or sex.
A．regard
B．regardless
C．in regard
D．disregard
单项选择题
It was a really bad accident - they’re lucky to be __________.
A．living
B．alive
C．live
D．lived
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