试题：
Many kinds of wild animals are     . We must do something to save them.
A．in factB．on holidayC．on timeD．in danger
固定搭配, 疑问词组, 助动词, 介词短语 2016-05-28

答案：

我来补答
D
根据后文的内容可知，be in danger，故选D
 
 
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