It is sometimes of great to explain to the patient what is happening.
A. technique
B. signal
C. importance
D. freedom
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A. technique
B. signal
(答案→)C. importance
D. freedom
解析：考查名词：A. technique技术，B. signal 信号，C. importance重要性，D. freedom自由，句意：向病人解释发生的事情，有时很重要。选C。