It is the pupils do in their spare time really prepares them to take their place in society as citizens when they grow up.
A. which; that
B. that; what
C. what; that
D. that; which
网友回答
A. which; that
B. that; what
(答案→)C. what; that
D. that; which
解析：C 考察主语从句和强调句型。第一空是主语从句，do后面缺少宾语，使用what，第二空是强调句型，使用that。