Question

【题目】Because of the poor defence work, the flood overflowed the riverbanks, ________ frequently happened in that area last decade.

A.as itB.whichC.itD.such

Answer 1

【答案】B

【解析】

考查定语从句。句意：由于防御工事做得不好，洪水漫过了河岸，这在那个地区近十年来经常发生。此处是整个句子作先行词，后面的非限制性定语从句用which引导，故选B。