【单选题】

Questions 18--21 are based on the following passage.

which of the following is elected in the United States
A、President.
B、Vice-president.
C、The members ofCongress.
D、All of above.

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根据网考网移动考试中心的统计，该试题：

11%的考友选择了A选项

4%的考友选择了B选项

35%的考友选择了C选项

50%的考友选择了D选项