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求解释the boy wants to know if there are any things on the moon

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求解释the boy wants to know if there are any things on the moon
A.alive B,living C .live D .lived
,为什么选B呢
完整的句子应该是:The boy wants to know if there are any things that are living on the moon.
后面that引导的句子是定语从句,可以省略that are,所以是选" living",动词的ing形式可作定语.
" alive "是形容词,没有这个功能.