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

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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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