单项选择题

Our scientific findings cannot be regarded as ______ in such a short period of time.

A．to have been obtained
B．to be obtained
C．having been obtained
D．being obtained
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单项选择题
During times of war or economic ______ many people convert their wealth into precious stones, which are transportable and more easily sold.
A．distraction
B．disturbance
C．tremor
D．vibration
单项选择题
It turned out that the officer was not ______ for the abuse of land.
A．to blame
B．to be blamed
C．to be blaming
D．to have been blamed
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