my brother was in his room ,______ in his experiment.

my brother was in his room ,______ in his experiment.

题目
my brother was in his room ,______ in his experiment.
a:absorb b:to absorb
c:absorbing d:absorbed
请问选哪一个答案,为什么?
答案
答案是D.be absorbed in something 的意思是“全神贯注于”.
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