you can walk along this street (u——) you find a big tree on your left.

问题描述:

you can walk along this street (u——) you find a big tree on your left.

你可以沿着这条路走,直到你发现你左边有一棵大树。小括号里的单词是until

until
你可以沿着这条街一直走,直到在你左手边找到一棵大树。

you can walk along this street (until——) you find a big tree on your left

应该是unless