单项选择题

At that time, we did not fully grasp the significance of what had happened.（）

A. give
B. attach
C. lose
D. understand

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单项选择题
The decision to invade provoked storms of protest.（）

A. caused
B. ignored
C. organized
D. received
单项选择题
He asserted that nuclear power was a safe and non-polluting energy source.（）

A. maintained
B. recommended
C. considered
D. acknowledged
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