------,he knows a lot about space and satel-lite.A.As he is a child B.Though he is child C.Childalthough he is D.Child though he is 为什么选D不选B呢?都不是很对啊!

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------,he knows a lot about space and satel-lite.A.As he is a child B.Though he is child C.Childalthough he is D.Child though he is 为什么选D不选B呢?都不是很对啊!
------,he knows a lot about space and satel-lite.A.As he is a child B.Though he is child C.Child
although he is D.Child though he is 为什么选D不选B呢?
都不是很对啊!

------,he knows a lot about space and satel-lite.A.As he is a child B.Though he is child C.Childalthough he is D.Child though he is 为什么选D不选B呢?都不是很对啊!
B.Though he is child
对应一般现在时

选B
因为逗号后he knows a lot about space and satel-lite.有主语he