It is very _____ for a person to know how fast a car is traveling.(横线填空)

It is very _____ for a person to know how fast a car is traveling.(横线填空)
六年级(第二学期)YLE P60页的选词填空题(understand,careful,fall down,difficult,within)
英语人气:545 ℃时间:2019-08-19 09:30:15
优质解答
difficult
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