Even though Tom _____ Chinese for three years before he came to China, it is sti

游客2023-09-18 44

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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