—Is it that Jack often plays computer games    makes his parents worry about him ?
—Yes , I think so .               
A．whatB．whenC．that D．which
C
考察強調(diào)句，強調(diào)句的特點是去掉it is that之后，句子完整，不缺少成分，即，that jack often plays computer gamesmakes his parents worry about him.
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