two exams to worry about, I have to work really hard this weekend.
A. With
B. Besides
C. As for
D. Because of
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(答案→)A. With
B. Besides
C. As for
D. Because of
解析：考查with复合结构。本题中缺少连词，说明逗号前面不能是一个句子，只能是一个短语；考查的省略with的复合结构。句意：因为担心两次考试，这个周末我不得不很努力地学习。故A正确。