His wife, to whom he _____ for 20 years, died of cancer last Thursday. ( )
A:had married
B:has been married
C:has married
D:had been married
把鸡蛋放在下列某物质中。可以制作“无壳鸡蛋”。该物质是( )
阅读下面这首唐诗,完成后面题目。
吴松道中二首(其二)
晁补之
晓路雨萧萧,江乡叶正飘。
天寒雁声急,岁晚客程遥。
鸟避征帆却,鱼惊荡桨跳。
孤舟宿何许?霜月系枫桥。
注:吴松:即吴淞,江名。
如图为初中化学常见气体的发生与收集装置.