问题补充：
It is typical of students to stay up deep into the night for the final exam.
A. to read
B. having read
C. to have read
D. reading
答案：
A. to read
B. having read
C. to have read
(答案→)D. reading
解析：句意：学生为了期末考试熬夜读书到深夜是常有的事情。这里read和stay up是同时发生的事情，用现在分词做伴随状语，选D。
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