if you work hard on english,it's not d__ to learn it well.横线处填以d开头的字母,应该是什么呢?

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if you work hard on english,it's not d__ to learn it well.横线处填以d开头的字母,应该是什么呢?
if you work hard on english,it's not d__ to learn it well.
横线处填以d开头的字母,应该是什么呢?

if you work hard on english,it's not d__ to learn it well.横线处填以d开头的字母,应该是什么呢?
difficult

difficult
绝对正确

difficult

difficult