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It _____ about twenty years since CCTV ____ to broadcast English programs.
A.has been; begunB.is; beganC.is; has begunD.was; began
B

试题分析: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。
点评: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。
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