og13 sc 17题

fausttao · 发表于 2014-2-14 10:41:42

Sunspots, vortices of gas associated with strange electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun's poles or equator.

为什么PAGE 708 解释里说 visible is a complement明明是表语主系表
补足语

wyw1018 · 发表于 2014-2-14 11:49:15

表语也叫主语补足语

og13 sc 17题

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