that they can't find the way to the library.
A:It seems
B:It seemed
C:They seem
D:They seemed
点燃20克含有O2、H2、N2的混合气体,充分反应后生成18克水,则剩余气体不可能是( )
他作为东西方文化交流的使者,在中国元朝生活了17年,他奇异的经历和广博的见闻,生动地留在了一部脍炙人口的著作中。他是( )
Alice____ ____her homework at home yesterday.