单项选择题


A．why
B．how
C．when
D．where
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单项选择题
A．to tryB．tryingC．to be triedD．to be trying
A．to try
B．trying
C．to be tried
D．to be trying
单项选择题
A．looked forB．looked intoC．looked overD．looked out
A．looked for
B．looked into
C．looked over
D．looked out
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