问题标题：
Hegotgoodgradesinhistests______hishardworkeveryday.A,becauseB,becauseofC,sinceD.lik
问题描述：
Hegotgoodgradesinhistests______hishardworkeveryday.A,becauseB,becauseofC,sinceD.lik
龙志颖回答：
答案：B
becauseof是复合介词,后接名词（hardwork）,而because是连接,后接句子.
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