____ the foreign student had learned Chinese for several years in his own country, he could

hardly understand the local Chinese in China.[ ]

A. Since

B. As

C. Unless

D. Though

中共七大之所以成为民主革命时期最重要的一次党代会主要是因为（）

A.召开于世界反法西斯战争胜利前夕

B.通过了毛 * * 《论联合政府的报告》

C.确立了毛 * * 思想为党的指导思想

D.为争取抗战最后胜利和新民主主义革命在全国的胜利作了准备