题目内容

We should do everything to protect the earth ,_______ we will lose our home .

A. and
B. for
C. but
D. or

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Althoudh it's raining ,_________ they are still working in the fields .

A. /
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C. and
D. so

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A. and
B. but
C. or
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A. if
B. Once
C. When
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Although
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D. Unless