[单选题]6.惟有相互了解，国与国才能增进信任，加强合作。
AWithout mutual understanding, it is impossible for countries to build trust promote cooperation with one another.
BIt is mutual understanding which makes it possible for countries to build trust promote cooperation with one another.
COnly mutual understanding can be one way for countries to build trust promote cooperation with one another.
DMutual understanding is one way only for countries to build trust promote cooperation with one another.
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