【单选题】

What made the writer start doubting the possibility of the trip
A．Getting a Russian visa.

B．The cold winter in Mongolia.
C．Inconvenient transport.
D．Poor living conditions.

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根据网考网移动考试中心的统计，该试题：

78%的考友选择了A选项

8%的考友选择了B选项

4%的考友选择了C选项

10%的考友选择了D选项

What made the writer start doubting the possibility of the tripA．Getting a Russian visa.