问题

John left home twenty minutes ago. It is usually half an hours drive from his home

John left home twenty minutes ago. It is usually half an hour"s drive from his home to the office here. So he ________ soon.

A. should have arrived B. need arrive

C. must have arrived D. may arrive

请帮忙给出正确答案和分析，谢谢！

参考答案

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