问题
选择题
He was about to tell me the secret someone patted him on the shoulder. [ ]
A. as
B. until
C. while
D. when
答案
答案：D
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He was about to tell me the secret someone patted him on the shoulder. [ ]
A. as
B. until
C. while
D. when
答案：D
X，则X→Y为F所逻辑蕴含
U，则X→Y为F所逻辑蕴含
U，则X→YZ为F所逻辑蕴含