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题目内容
（石家庄铁道大学大学英语1）
The boy ______ . Spanish for six years by the time he takes his examination.
A、 has studies
B、 will have studied
C、 has been studying
D、 had studied
A、 has studies
B、 will have studied
C、 has been studying
D、 had studied
参考答案
