18．--- Tom has a lot of parties recently.
---Yes, that may why he didn’t do well in the test.
A, sum up B. add up to C. account for D. make sense of
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解析：考查短语辨析。sum up 总结，add up to 加起来，account for 解释，make sense of 明白什么的意思，句意：汤姆最近参加了许多聚会。是的，那样可能解释了为什么他在考试中没有做好。所以选C。