2. 外语
  3. Even though Tom _____ Chinese for three years before he came to China, it is still difficult for him to express himself.

Even though Tom _____ Chinese for three years before he came to China, it is still difficult for him to express himself.

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问题 Even though Tom _____ Chinese for three years before he came to China, it is still difficult for him to express himself.
选项 A、studies
B、has studied
C、had been studying
D、was studied
答案C
解析 本题考查动词的时态。句中含有一个before引导的时间状语从句，从句部分谓语动词为一般过去时，主句部分应该用过去完成时或过去完成进行时，即had done或had been doing，其中had been doing表示动作持续到过去某一时间还在延续。因此此处选C。
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