Tom get home ( )4 o' ciock.A.at around B .about C.about around D.around请说明原因(为什么答案不一致?)

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Tom get home ( )4 o' ciock.A.at around B .about C.about around D.around
请说明原因(为什么答案不一致?)

D.Tom gets home around 4 O'clock.
Tom 大概4点钟回到家
若用 at 就表示 4 点正,at around.