单项选择题

It is not so much the language（）the culture background that makes the book difficult to understand.

A、but
B、nor
C、as
D、like

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单项选择题

The three man tried many times to sneak across the border into the neighbouring country（）by the police each time

A、had been captured
B、being always captured
C、only to be captured
D、unfortunately captured

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国际空中航行的一般规则

A、关于无人驾驶航空器的规定
B、关于设立禁区和暂时限制飞行的规定
C、遵守飞入国的法律制度
D、航空器应具备必要的文件