题目

? Did you sleep well last night??Far from that! One of my neighbours        music pretty loud.A.playsB.was playingC.is playingD.would play 答案:【答案】B【解析】句意:?你昨晚睡得好吗??远非如此!我的一个邻居在大声演奏音乐。A. plays一般现在时态;B. was playing 过去进行时态;C. is playing 现在进行时态; D. would play过去将来时态。结合语境可知,昨晚睡不好觉的原因是当时有人在演奏音乐,故用过去进行时态来描述,答案为B。 在平面直角坐标系中,菱形OABC的两个项点为O(0,0),A(1,1),且OA•OC=1,则AB•AC等于 .
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