Question

【题目】Going camping in the desert will not be enjoyable __________ you are well prepared.

A. because B. when

C. unless D. until

Answer 1

【答案】C

【解析】

考查状语从句。句意：除非你准备充分，否则在沙漠里露营是不愉快的。A. because因为； B. when当---时候；C. unless除非；D. until直到---为止。故选C。