It about twenty years since CCTV to broadcast English programs.
A. has been; begun
B. is; began
C. is; has begun
D. was; began
网友回答
A. has been; begun
(答案→)B. is; began
C. is; has begun
D. was; began
解析：考查固定句型。固定句型：it is/has been 一段时间since从句。句意：自从…以来。已经一段时间了。Since后面使用过去时，指从过去开始到现在，前面可以使用一般现在时，也可以使用现在完成时。句意：自从中央电视台播放英语节目到现在已经有20多年了。故B正确。