单项选择题

We must ______ a solid foundation for the development of our heavy industry．

A．take
B．put
C．lay
D．raise
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单项选择题
Tom，with a dog，______standing at the gate．
A．Was
B．were
C．are
D．have been
单项选择题
When one is unfamiliar with the customs，it is easy to make a______.
A．failure
B．flaw
C．false
D．mistake
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