----Has your uncle come back from England for a summer holiday?

----Yes. But he _________ at home for only a few days. Now he has been back to London.

A．stayed

B．has stayed

C．had stayed

D．is staying

生产经营单位主要负责人在本单位发生重大生产安全事故时，不立即组织抢救或者在事故调查处理期间擅离职守或者逃匿的，给予降职、撤职的处分，对逃匿的处( )天以下拘留；构成犯罪的，依照刑法有关规定追究刑事责任。

A．30

B．20

C．15

D．10