(单选题)
When you visit ______ foreign country, it is important to know how to ask for help.
A.a
B.an
C.the
D./
参考答案：A
参考解析：
考查不定冠词a的用法。句意：当你访问外国时，知道如何寻求帮助是很重要的。根据句意可知，此处表示泛指，且foreign以辅音音素开头，所以应该用不定冠词a。故选A。
知识点：
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