不属于穿过白令海峡“三线”的是[ ]
A、俄罗斯与美国的分界线
B、国际日期变更线
C、亚洲与北美洲的分界线
D、亚洲与加拿大的分界线
答案：D
He was very busy yesterday，otherwise he__________to the meeting.
A．would come
B．came
C．would have come
D．had come
变压器缺油对运行有什么危害？
