1.I didn’t manage to do it _____ you had explained how.
A.until B.unless C.when D.before
答案:A
答案解析
not…until…结构。【译文】 直到你解释如何做后我才能做好它。
2.Until the present century, ________ demand for natural gas.
A.little B.and little C.there was little D.was there little
答案:C
答案解析
本句考查there be句型，until the present century为状语从句，本句只是把状语从句置于句首，无需倒装，否定连词not until引导状语从句时需倒装。【译文】 直到本世纪才对天然气有要求。
3. Please write your composition ________ line to leave space for the teacher's correction .
A.one another B.every other C.any other D.each other
答案:B
答案解析
every other…每隔一个／每两个。one another:彼此、互相；any other:任何；each other：互相、彼此【译文】 请写作文时隔行写，以便留出空间供老师批改。
4. The cost of oil is less than _______ of gas.
A.it B.one C.the one D.that
答案:D
答案解析
that of gas中的that指代的是前句中的cost 【译文】 油的成本比气的成本要低。
5. ______ was the situation we were facing .
A.So B.Such C.What D.It
答案:B
答案解析
such代替前面所说的情况。【译文】 这就是我们面对的形势。
