单项选择题

Last month more than a hundred workers were killed in the mine _________.

A．exploitation
B．explosion
C．explication
D．explosivity
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单项选择题
She tried hard, but she still couldn''t make us _______our mind.
A．to change
B．changed
C．change
D．changing
单项选择题
Seldom _______my boss in such good mood(心情) since I came to work in this company.
A．I saw
B．I have seen
C．have I seen
D．do I see
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