问题补充：
I don’t know why he has been absent class for so long.
A. in
B. for
C. with
D. from
答案：
A. in
B. for
C. with
(答案→)D. from
解析：考查短语：be absent from 缺席什么，句意：我不知道他为什么这么长时间了没来上课。所以选D。
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