---Sunday is a public holiday, children should get close to nature.
---But most of them have several lessons to attend.
A. when
B. which
C. where
D. what
网友回答
(答案→)A. when
B. which
C. where
D. what
解析：考查定语从句。句中先行词为holiday，在从句中作时间状语，故用关系副词when。句意：——周日是一个公共假日，孩子们在这一天应当亲近自然。——但他们大多数要上许多课。故A正确。