Mr Wangan article on how to improve spoken English last month, but I don’t know whether he

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A. has written
B. wrote
C. had written
(答案→)D. was writing
解析：此题旨在考查一般过去时态和过去进行时态的区别。一般过去时态表示动作已完成，而过去进行时态则表示动作并未完成，但后面分句指出”但我不知他现在是否写完”，因此答案为D。此题容易受last month的干扰而误选B项。