题目

Did you know who d________ America? 答案：(d)iscovered【解析】 【详解】 句意：你知道是谁发现了美国么？动词 “know”后是 “who” 引导的宾语从句，主句是一般过去时，结合句意可知，从句也是一般过去时，从句缺谓语动词，根据 “America” ，及首字母提示，可知表达 “ 发现美国 ” ，用动词过去式 “discovered” 。故填 (d)iscovered 。 I called Hannah many times yesterday evening, but I couldn’t get through．Her brother ________ on the phone all the time! [　　] A． was talking B． has been talking C． has talked D． talked