Try your best.It is not a _____{difficult或early}sum

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Try your best.It is not a _____{difficult或early}sum

difficult
如果是early,那a 就应该是an,用a修饰的词,后面的词的开头如果是元音,那就用an.

difficult

easy ba

difficult.尽力去做吧,这个计算不是很难.