I had just about given myself up for lost I was spotted by a ship.A. whenB. whileC. asD.

问题补充：

I had just about given myself up for lost I was spotted by a ship.

A. when

B. while

C. as

D. until

答案：

(答案→)A. when

B. while

C. as

D. until

解析：考查连词：A. when当…时候（表示时间点）B. while当…时候（表示时间段）C. as随着，因为， D. until直到，就在我要绝望而放弃之时，幸被一艘船发现获救。I had just about given myself up，这里用的是过去完成时，就要放弃之时，when表示“这时”，选A。