______ 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

______ 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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