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【单选题】
Why did they go back to the crossroads?A.
Because they left something behind.
B.
Because they got lost.
C.
Because an oak fell down and blocked the way.
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反馈参考答案：
举一反三
【单选题】Hardly ______ when a loud explosion was heard.
A.
the train had started
B.
the train had been started
C.
had the train started
D.
the train started
【单选题】Hardly ______ when a loud explosion was heard.
A.
the train had started
B.
the train had been started
C.
had the train started
D.
did the train start
【简答题】汽车在正常行驶时,汽车的全部电器用电均由 供给
【单选题】欲使下图1所示的截面圆（其中图1种的Sketch在实体模型上底面的上方）创建图2所示的拉伸特征，最为合理的拉伸方式应是,【图片】
A.
使用“直到下一个”进行拉伸
B.
使用“贯通”进行拉伸
C.
使用"直到选定"进行拉伸
D.
使用“直到被延伸”进行拉伸
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