A plane must go on a running way before it___or___(lands/landed;takes off/took off)

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A plane must go on a running way before it___or___(lands/landed;takes off/took off)
A plane must go on a running way before it___or___(lands/landed;takes off/took off)

A plane must go on a running way before it___or___(lands/landed;takes off/took off)
lands
takes off

lands,takes off
这里完全不涉及到过去的情况,只是就事论事。所以应该用现在时。

lands takes off
飞机起飞或是降落都必须经过一段跑道
这是常识 也是一般现在时

都用一般现在时 即lands 和 takes off
含义:飞机在它着陆和起飞之前都必须滑行一段路程。
在这时在讲诉一个一般性常识,不是在说一个过去发生的事情,所以用一般现在时不用过去时态。it 指plane 是单三 所以,在动词尾加s.

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