【题目】—Jimmy had a lot of parties recently.
—Yes, that might why he didn't do well in the test.

【答案】account for
【解析】句意：——吉米最近有许多的晚会。——是的，那可能就是他在考试中没有考好的原因。account for“说明……的原因”，情态动词后接动词原形，故填account for。