单项选择题

Where could she ______ the key I couldn't find anywhere.

A．put
B．have put
C．has put
D．had put
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单项选择题
It is indicated in the passage that electronic animals have ______.
A．the same growth rate as living animals
B．the same life habit as living animals
C．the same food habit as living animals
D．the same appearances as living animals
单项选择题
It's because he helped you ______ I'm ready to help him.
A．why
B．since
C．so
D．that
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