This is an illness that can result in total blindness _____ left untreated. [

题型：0107 模拟题难度：来源：

This is an illness that can result in total blindness _____ left untreated. [ ]
A. after
B. if
C. since
D. unless

答案

举一反三

_____ he has made up his mind to do something, nothing will stop him. [ ]
A. Once
B. Before
C. Although
D. As soon as

题型：吉林省模拟题难度：| 查看答案

It still puzzles today"s scientists _____ some mammals produce their young _____ others lay eggs to produce
their offspring (后代). [ ]
A. that; while
B. what; while
C. that; as
D. what; as

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Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes
to classroom tests. [ ]
A. before
B. since
C. when
D. after

题型：0108 模拟题难度：| 查看答案

I"ll never forget such a beautiful place _____ I spent my childhood there with my grandma.

[ ]

A. that
B. although
C. where
D. because

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Losing weight is no easy task. A lot of people who lost weight gain it back over time and end up
back ____ they started.[ ]
A. when
B. where
C. since
D. after

题型：0108 模拟题难度：| 查看答案