问题
选择题
Carl hopes to win the tennis game one day. That is he has been practicing hard.
A．why
B．how
C．because
D．where
答案
A
题目分析： 句意：Carl希望有一天赢得网球比赛。这是他为什么努力训练的原因。That is why…，这就是为什么，That is because…那时因为…，所以选A。
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