With so much noise of the traffic I couldn`t and do my research work.A. put downB. settle

问题补充：

With so much noise of the traffic, I couldn`t and do my research work.

A. put down

B. settle down

C. break down

D. take down

答案：

A. put down

(答案→)B. settle down

C. break down

D. take down

解析：短语辨析。A写下；镇压；B定居；安静C崩溃，出故障；D拆卸，记下；句意：有如此大的噪音，我无法安静下来做研究工作。根据句意说明B正确。