请教一个语法问题

转折 · 发表于 2004-4-14 21:35:00

it is (highly) recommended that any person (expoling) a cave (carries) a source of (artifical) light.

请问错误的是那一个，另外能不能给提供跟本题相关的知识点。谢谢

转折 · 发表于 2004-4-14 21:46:00

if the pattern of volcanic (eruptions) continues, (another)lava flow might (have occurred) within the next (few hundred)years.
还有这个，请大虾门指教

susei · 发表于 2004-4-19 14:18:00

1. carries ~carry.recommend (should)do sth.动词原形

susei · 发表于 2004-4-19 14:20:00

2.have occurred ---occur

从局是一般条件句,主句不要用虚拟语气

所属分类: TOEFL / IELTS