题目内容
We should wear bicycle helmets when riding.
| A．when you ride | B．you are riding |
| C．when we are riding | D．when you are riding |
C
解析试题分析：句意：我们骑自行车的时候应该戴头盔。when riding是一种省略形式，只有当从句的主语和主句的主语一致的时候才可以把从句的主语连带系动词一起省略。选项ABD的主语和主句的主语都不一致，均排除。故选C。
考点：考查省略。
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