He found it hard to concentrate on his writing ( ) so many peo

He found it hard to concentrate on his writing ( ) so many people around.
A、when
B、during
C、because
D、with
【正确答案】：D
【题目解析】：with 原因/伴随状语，由于；When 时间状语； because 原因状语；during 时间状语。句子含义是他发现有很多人在身边时，很难集中精力写作。