Noise is unpleasant, when you are trying to sleep.
A. especially
B. specially
C. extremely
D. naturally
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(答案→)A. especially
B. specially
C. extremely
D. naturally
解析:词义辨析。Especially特别,尤其;specially专门地,特地地;extremely极端地;naturally自然地。句意:噪音令人很不愉快,尤其是当你正要睡觉时。所以选A。