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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

You'll not make any progress ______ you get rid of your bad habit of study.

I always get up early on weekdays, ______I'm afraid I will be late for school.

WeChat(微信) is widely used. ________ the young________the old are interested in it.

They will lose the game ________ they try their best.

—How is David getting on with the exam？

—He tried his best, he still didn't pass it.

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