—Is it that Jack often plays puter games makes his parents worry about him ?
—Yes , I think so .
A. what
B. when
C. that
D. which
网友回答
A. what
B. when
(答案→)C. that
D. which
解析：考察强调句，强调句的特点是去掉it is that之后，句子完整，不缺少成分，即，that jack often plays puter gamesmakes his parents worry about him.