解析:因good earth(沃土) 与wash away(冲走) 是被动关系,排除C;又因quantities of…作主语,谓语动词用复数,排除B;指近阶段(近些年) 正在发生的事,用现在进行时,排除A;故选D。
4.
—The window is dirty. —I know. It ______ for weeks.(http://yingyu.chazidian.com)
A. hasn’t cleaned B. didn’t clean C. wasn’t cleaned D. hasn’t been cleaned
解析:由is和for weeks可知,要用现在完成时态,排除B和C;又因It (The window) 与clean是被动关系,要用被动语态,所以选D。
5.
—George and Lucy got married last week. Did you go to the wedding?
—No, I ______. Did they have a big wedding?
A. was not invited B. have not been invited
C. hadn’t been invited D. didn’t invite
解析:因为I与invite是被动关系,又因为邀请应当发生在结婚之前,got married是过去,invite就该是过去的过去,所以用过去完成时的被动语态,只有C正确。
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