It is the pupils do in their spare time really them to take their place in society as citizens when they grow up.
A. what; that; prepare
B. that; what; prepares
C. what; that; prepares
D. that; what; prepare
网友回答
A. what; that; prepare
B. that; what; prepares
(答案→)C. what; that; prepares
D. that; what; prepare
解析：考查从句辨析。It is...that是强调句型，可以强调除谓语外的任何成分，这里强调的是主语从句，主语从句the pupils do in their spare time中的do缺少宾语，用what引导主语从句，that引导主语从句不作成分，排除B、D；句子作主语相当于第三人称单数，故，谓语用单数，排除A；故选C。