单项选择题

The doctor came out of the patient''s room with a _________look on his face.

A．serious
B．silent
C．simple
D．slight
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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
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
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