My father began to work a bus driver when he was twenty years old.A. forB. toC. atD. as

My father began to work a bus driver when he was twenty years old.
A. for
B. to
C. at
D. as

A. forB. toC. at(答案→)D. as解析：可联系答.案.网客服索取。

谢谢了

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