【单选题】

You may get some infectious diseases _______.
A．when arriving in Hong Kong

B．before you understand them
C．within 2 weeks of your arrival in Hong Kong
D．before arriving in Hong Kong

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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

85%的考友选择了B选项

1%的考友选择了C选项

7%的考友选择了D选项

You may get some infectious diseases _______.A．when arriving in Hong Kong