A
从位置上来讲,只有A,B 能置于这个地方（助动词和行为动词之间）,yet 和before 一般置于句尾
just“ 刚刚”,意思隔得太远
从意思上来讲,before 最接近,但一般置于句尾,即：
Have you traveled on a plane 【before】?
比较：
Have you 【 already 】 traveled on a plane?
请在客户端右上角评价点“满意”即可,
Have you ever traveled on a plane?(哪个词能替换句中的ever,为什么?）
1个回答
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