Mark was intent on maintaining his status as first in his class; because even the smallest mistakes infuriated him, he reviewed all his papers ________ before submitting them to his teacher.
句意： 马克下决心保持他在班上的第一名， 因为即使是最小的错误也会激怒他， 所以在交给老师之前， 他把所有论文都认真地检查了一遍。 assiduously刻苦地； 勤勉地。 explicitly明确地。 perfunctorily敷衍地。 honestly诚实地。