问题
选择题
Drivers are warned___________when they are tired.
A．to drive
B．not drive
C．not to drive
D．not driving
答案
答案：C
本题考查动词用法。warn sb not to do sth，表示警告某人不要做某事。句意：司机被警告当他们劳累的时候不要开车。
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Drivers are warned___________when they are tired.
A．to drive
B．not drive
C．not to drive
D．not driving
答案：C
本题考查动词用法。warn sb not to do sth，表示警告某人不要做某事。句意：司机被警告当他们劳累的时候不要开车。