When this boy was asked to copy down the sentence ten times, he did nothing but deeply with a blank look on his face.
A. sigh
B. sight
C. sign
D. signal
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(答案→)A. sigh
B. sight
C. sign
D. signal
解析:考查词义辨析:A. sigh叹气,B. sight视力,风景,景色,C. sign标志, D. signal信号,句意:当男孩被要求把句子抄10遍,他只好深深的叹气脸上是茫然的表情。选A。