mountains of homework，students today are busy with all kinds of activities.
A. In addition to
B. In spite of
C. As long as
D. Instead of
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(答案→)A. In addition to
B. In spite of
C. As long as
D. Instead of
解析：短语辨析。A除…之外；B不管，尽管；C只要（连词）；D代替，而不是；句意：除了堆积如山的家庭作业以外，当今的学生还要忙于参加各种活动。根据句意说明A正确。