The first textbook ______ for teaching English as a foreign language came out in

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问题 The first textbook ______ for teaching English as a foreign language came out in the 18th century.

选项 A、having written
B、to be written
C、being written
D、written

答案 D

解析过去分词用法，此处作后置定语修饰textbook，textbook与write之间存在被动关系，排除A，正确答案为D，相当于which was written。to be written指将要进行的动作，being written强调动作的进行状态，不符合句意。

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Howdoscientistsestimatetheageoflanguage?[originaltext]Scientistshav