单项选择题

A．because
B．caused
C．due
D．owed
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单项选择题
What does the speaker think of the invention of the bow
A．Not easy to be used.
B．Not powerful enough.
C．Not beneficial for man.
D．A great progress for man.
单项选择题
A．whereverB．anywhereC．whereD．whenever
A．wherever
B．anywhere
C．where
D．whenever
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