1925年，第（）次全国劳动大会宣告了中华全国总工会的成立 A.一 B.二 C.三

— Did you see the beginning of the film?

— No. It ________ for 20 minutes when I got to the cinema. [ ]

A. has been on

B. had been on

C. had begun

D. has begun

如图，历史遗迹或文物是传承历史的重要载体，其中有些是中 * * 大家庭友好交往的历史见证。下面这些历史遗迹、文物，不属于此种类型的是：

—Sorry , I can't go shopping with you tonight.

—______. [ ]

A. Why don't you ask Bill ?  

B. Excuse me . Which is the way to the shop?

C. It's very kind of you .      

D. That's OK. Maybe some other time .

缓进性高血压的病理学改变及临床病理联系。