The brightly colored kingfisher that perches until it sights a fish,
then dives into the water to catch its prey.
Ans. : B (要去掉 that)
我想問一下句子的結構 :如果去掉 that, 因為那郭 then 後面 dives 素動詞, 但是 then 是副詞不能當連接詞
請問這樣的句子結構對嗎 ? 不會構成 run-on sentence 嗎 ??