单项选择题

In the United States, amendments must have the approval of ______ of the states before they enter into force.

A. one-third
B. two-thirds
C. two-fifths
D. three-fourths
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单项选择题
The safeguards against abuse of powers in the United States come in the form of ______.
A. separation of powers
B. executive orders
C. presidential elections
D. judicial reviews
单项选择题
The US Constitution was officially adopted on March 4, ______.
A. 1776
B. 1781
C. 1787
D. 1789
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