By the time ______ (人们来营救他时,他已被困在倒塌的洞穴里) for three days.

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问题 By the time ______ (人们来营救他时,他已被困在倒塌的洞穴里) for three days.

选项

答案people came to his rescue, he had been trapped in the collapsed cave

解析 本题测试过去完成时的用法。本题还测试词组come to one’s rescue和单词trap, collapse,cave的用法。
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