The earth will become worse and worse ______ we do something to stop her from be

题型：期末题难度：来源：

The earth will become worse and worse ______ we do something to stop her from being polluted. [ ]
A. if
B. even if
C. when
D. unless

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举一反三

We don"t know ______ he will come or not. [ ]
A、if
B、whether
C、unless
D、when

题型：广东省期中题难度：| 查看答案

— Did you return Fred"s call?
— I didn"t need to, ______ I"ll see him tomorrow. [ ]
A. though
B. when
C. unless
D. because

题型：安徽省期中题难度：| 查看答案

— After the 2008 Olympic Games, more and more people in western countries begin to learn Chinese ______
they can better understand the culture of China.
— I"m sure they will. [ ]
A. even though
B. so that
C. because of
D. as if

题型：期中题难度：| 查看答案

I was just at the school gate the bell rang. [ ]
A. while
B. because
C. if
D. when

题型：重庆市期中题难度：| 查看答案

____ I have a lot of homework to do every night. I still spend half an hour watching TV. [ ]
A. If
B. Because
C. After
D. Even though

题型：同步题难度：| 查看答案