具有大专学历，连续从事保安工作2年以上的，可以申报高级保安员。
参考答案：对
He was very busy yesterday, otherwise he ____ to the meeting.
A．would come
B．came
C．would have come
D．had come
一种细菌的半径是0.000 005 6米，用科学记数法表示为______米．
