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题型：单选题题类：常考题难易度：普通

My friend Max started to play football ______ he was seven years old.

A、since B、when C、if D、while

举一反三

Machine will do a lot of work ________ many people will have little work to do.

Something must be done to stop air pollution, we will have no fresh air.

Bob, dinner is ready. Please wash your hands you eat.

Lin Shuhao is famous all the basketball fans in China know him.

As far as we know, safety comes first{#blank#}1{#/blank#}(无论什么) you do.

Nick can help his mum do a lot of housework, he is only 6 years old.

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