单项选择题

A．being frustrated
B．frustrate
C．frustrated
D．frustrating
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单项选择题
A．becauseB．causedC．dueD．owed
A．because
B．caused
C．due
D．owed
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.
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