问题补充：
The little girl was afraid of having her bad tooth pulled out. The dentist tried hard to put her .
A. at last
B. at hand
C. at ease
D. at least
答案：
A. at last
B. at hand
(答案→)C. at ease
D. at least
解析：短语辨析。A最后，终于；B在手边，在附件；C自在，安心；自由自在；D至少；句意：那个小女孩害怕拔牙。所以牙医努力让她安心。故C正确。
