单项选择题

As he didn't like the TV programme, he ______ another channel.

A．changed into
B．switched to
C．converted to
D．turned to
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单项选择题
Deep, lasting behavioral changes cannot be ______ from the outside.
A．imposed
B．emerged
C．installed
D．inserted
单项选择题
The officials called for an immediate ______ to determine the cause of the accident.
A．investigation
B．preparation
C．recognition
D．observation
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