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--Has your brother returned from Libya yet?

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--Has your brother returned from Libya yet?
--Has your brother returned from Libya yet?
--Yes,but he ____ at home for only a week before his company sent him to China.
A.would be B.was C.has been D.is
为什么不选A?
--Has your brother returned from Libya yet?
因为要跟句子后面的时态一致:his company "sent" him ...
would be 是还没发生的未来时
was 表示他回来了,只停留了一周又被派往中国了.