单项选择题

Nancy was surprised that they have ______. They seemed to be a happy couple.

A．split up
B．broken down
C．fallen through
D．knocked out
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单项选择题
Although the colonists ______ to some extent with the native Americans, the Indians' influence on American culture and language was not extensive.
A．migrated
B．matched
C．mingled
D．melted
单项选择题
There is supposed to be a safety ______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
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