问题:
Tom ______ in China now. He called his parents once a week.
[ ]
A. is studying
B. will study
C. has studied
D. studied
Tom ______ in China now. He called his parents once a week.
B. will study
C. has studied
D. studied
[ ]
A. is studying B. will study
C. has studied
D. studied
参考答案: