When you lift some heavy objects, be sure to do enough stretching______you run the risk of back injury.

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问题 When you lift some heavy objects, be sure to do enough stretching______you run the risk of back injury.

选项 A、either
B、on account of
C、or else
D、besides

答案C

解析 语法:连词1 空格后主语和动词构成的句子结构完整,(B)选项的on accounf of和(D)选项的besides都是介词,因此可排除。(A)选项的either是副词,没有连接的作用,因此也可排除。2根据句意“如果不做伸展运动,背部就会受伤”很容易选出or else,意为“否则”,因此(C)为正确选项。
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