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

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?
英语人气:845 ℃时间:2019-09-17 14:46:59
优质解答
答案是D.be absorbed in something 的意思是“全神贯注于”.
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