题目

There was left________smoke after the plane flew away. A.a line of        B.a column of C.a pile of                D.a row of   答案: B 1. 本句意为“飞机飞过后,留下一根烟柱”。a column of意为“一柱……”;a line of和a row of 是“一排,一行”的意思;a pile of意为“一堆”。
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