单项选择题

Five minutes earlier, () we could have caught the last train.

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

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单项选择题
The company's employment policy makes it clear that men and women have () opportunities.

A. equivalent
B. identical
C. balanced
D. equal
单项选择题
() we all know, it is impossible to speak or write English or any other language without using the verb.

A. For
B. Since
C. As
D. Which
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