摘要: Now and then they would our house and have a talk with us. A. call on B. drop in at C. drop in on D. drop in[解析]B drop in 意为“顺便走访.不预先通知的拜访 .为不及物动词.其后不接宾语.若要接宾语.遵循以下原则:表示拜访某人.后接介词on,表示拜访某地.后接介词at.call 表示“拜访 时也遵循以上原则.即 call at 后接地点.call on 后接人.

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