——Where is Mr. Black? I can’t find him.

——Oh, he ________ his car behind the house now.

A．washed

B．is washing

C．will wash

D．has washed

中国工人阶级登上政治舞台是在 [ ]

A．辛亥革命期间

B．五四爱国运动期间

C．京汉铁路工人成立总工会时

D．省港大罢工时