my brother was in his room ,______ in his experiment.a:absorb b:to absorbc:absorbing d:absorbed请问选哪一个答案,为什么?
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![my brother was in his room ,______ in his experiment.a:absorb b:to absorbc:absorbing d:absorbed请问选哪一个答案,为什么?](/uploads/image/z/7392887-71-7.jpg?t=my+brother+was+in+his+room+%2C______+in+his+experiment.a%3Aabsorb+b%3Ato+absorbc%3Aabsorbing+d%3Aabsorbed%E8%AF%B7%E9%97%AE%E9%80%89%E5%93%AA%E4%B8%80%E4%B8%AA%E7%AD%94%E6%A1%88%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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