______ 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
出自：西安石油大学大学英语二
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______ 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
出自：西安石油大学大学英语二