题目

He has been in bed ______ he fell off his bike a week ago.A. even if B. soon afterC. now that D. ever since 答案：【答案】D【解析】试题分析：考查从句连接词。A即使，引导让步状语从句；B不久之后；C既然；D自从，从那以后。现在完成时+since+含过去时的句子，意为“自从......就......”，故选D项。考点 : 考查从句连接词电路展板如图示（导线在展板背面），展示情况如下表。 开关状态S1、S2都闭合S1闭合、S2 断开S1断开、S2闭合灯亮不亮不亮电铃响响不响根据展示情况画出电路图。