Buried in his homework,he can't go out to play.
因为作业堆积如山,所以他不能出去玩.
bury
vt.
埋葬, 掩埋, 隐藏
是否选A跟bury这词儿没关系,而是固定句型.这个句子的正常语序其实是：He can't go out to play because he is buried in his homework,. 这类句子还有,如：Caught by the rain, he is wet through.(因为被雨淋了,他全身湿透.)
这里bury要用被动语态,因为他是被作业掩埋.