etain 保留
The wall is part of a large retaining wall这堵墙是一面保留下来了的巨大的墙体的一部分
retain虽然加了ing,但从句意可以看出,它其实是过去了的动作.那么build就是在retain之前的动作了,是“过去的过去”的动作,所以用了过去完成时.
不明白的再问哟!
The wall is part of a large retaining wall that Herod the Gr
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