问题
选择题
The children ___ not to play football in the street.
A．warn
B．warned
C．must warn
D．are warned
答案
答案：D
这是被动语态, be warned not to do,意思是: 警告某人不要做……
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The children ___ not to play football in the street.
A．warn
B．warned
C．must warn
D．are warned
答案：D
这是被动语态, be warned not to do,意思是: 警告某人不要做……