Jack stood there until he finally lost sight of the train.

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问题 Jack stood there until he finally lost sight of the train.

选项 A:couldn't see       
B:look
C:lose       
D:can't see

答案A

解析lose sight of:看不见。题干意思为:杰克站在那儿,一直等到火车在视线中消失。因为句子是一般过去时,故而选择A。
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