问题
Is the doctor your sonHas he graduated from university—Yes，he in Nanjing Medical University for 5 years.
A:has been studying
B:studies
C:had studied
D:studied;
B:studies
C:had studied
D:studied;
正确答案是：
同类题型
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ful accident ___, however, occur the otherday.” The old man repeated, trembling all over.