题目

the police found out one clue that voices were heard for help from some very distant place
a to call b calling 感官动词被动不是加 to do 可是答案选的是b heard后面

提问时间：2021-01-03

答案

The police found out one clue that voices were heard ___ for help from some very distant place
a to call b calling
选b.
因为hear sb calling/call 变成被动形式是sb be heard doing/ to do
句意是【当时正在呼救】,所以用hear sb calling,变成被动形式是sb be heard doing.
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