驾驶车辆变更车道时，应提前开启转向灯，注意观察，保持安全距离，驶入要变更的车道。
参考答案：对
(2013·兰州一中考前冲刺)It is the third time so far that such a festival________in my hometown.
A．is held
B．has been held
C．will be held
D．had been held
