The writer was _________ in his writing that he forgot to flick the ashes from his cigar．
A.concentratedB.devotedC.absorbedD.fixed在线课程C
concentrate不用被动形式，与介词on搭配，意为“集中精力于……”；be devoted与介词to搭配，意为“专注于”；fix常构成fix one’s attention/mind upon短语。句意：作家全神贯注地进行写作，忘了弹去雪茄烟的烟灰。