away from school for two weeks, I have quite a few lessons to catch up with.
A. Having been
B. To be
C. Been
D. Being
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(答案→)A. Having been
B. To be
C. Been
D. Being
解析：A 考察非谓语动词。分析句子结构可知，逗号前面是非谓语动词做原因状语，且与逻辑主语是主动关系，由此排除BC项，空格处的动作是在谓语动词之前就发生的，因此使用现在分词的完成式。故A正确。