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题目内容
（西安石油大学大学英语二）
______ his parents sent him to school. ( )(本题1.0分)
A、 When he was seven years old
B、 Being seven years old
C、 When seven years old
D、 When at seven
A、 When he was seven years old
B、 Being seven years old
C、 When seven years old
D、 When at seven
参考答案